List of all server notification codes

The following page provides an overview of all notifications in Neo4j, along with some scenarios and their possible solutions.

PERFORMANCE notifications
HINT notifications
UNRECOGNIZED notifications
UNSUPPORTED notifications
DEPRECATION notifications
SECURITY notifications
TOPOLOGY notifications
SCHEMA notifications
GENERIC notifications

`PERFORMANCE` notifications

Performance notifications are returned whenever the query uses costly operations and the performance may be improved by changing the query or adding an index.

Cartesian product

This notification is returned when there is a Cartesian product in the plan.

Table 1. Notification details
Neo4j code	`Neo.ClientNotification.Statement.CartesianProduct`
Title	This query builds a cartesian product between disconnected patterns.
Description	If a part of a query contains multiple disconnected patterns, this will build a cartesian product between all those parts. This may produce a large amount of data and slow down query processing. While occasionally intended, it may often be possible to reformulate the query that avoids the use of this cross product, perhaps by adding a relationship between the different parts or by using OPTIONAL MATCH (`%s`)
Category	`PERFORMANCE`
GQLSTATUS code	`03N90`
Status description	info: cartesian product. The disconnected patterns `{ $pat }` build a cartesian product. A cartesian product may produce a large amount of data and slow down query processing.
Classification	`PERFORMANCE`
SeverityLevel	`INFORMATION`

Example 1. A query that contains many disconnected patterns

Query

MATCH (c:Child), (p:Parent) RETURN c, p

Description of the returned code

If a part of a query contains multiple disconnected patterns, this will build a cartesian product between all those parts. This may produce a large amount of data and slow down query processing. While occasionally intended, it may often be possible to reformulate the query that avoids the use of this cross product, perhaps by adding a relationship between the different parts or by using OPTIONAL MATCH (identifier is: (p))

Suggestions for improvement

In case a Cartesian product is needed, nothing can be done to improve this query. In many cases, however, you might not need a combination of all children and parents, and that is when this query could be improved. If for example, you need the children and the children’s parents, you can improve this query by rewriting it to the following:

MATCH (c:Child)-[:ChildOf]->(p:Parent) RETURN c, p

Query

MATCH (c:Child), (p:Parent) RETURN c, p

Returned GQLSTATUS code

03N90

Returned status description

info: cartesian product. The disconnected patterns (c:Child), (p:Parent) build a cartesian product. A cartesian product may produce a large amount of data and slow down query processing.

Suggestions for improvement

MATCH (c:Child)-[:ChildOf]->(p:Parent) RETURN c, p

Unbounded variable length pattern

This notification is returned when there is no upper bound specified on the variable length relationship.

Table 2. Notification details
Neo4j code	`Neo.ClientNotification.Statement.UnboundedVariableLengthPattern`
Title	The provided pattern is unbounded, consider adding an upper limit to the number of node hops.
Description	Using shortest path with an unbounded pattern will likely result in long execution times. It is recommended to use an upper limit to the number of node hops in your pattern.
Category	`PERFORMANCE`
GQLSTATUS code	`03N91`
Status description	info: unbounded variable length pattern. The provided pattern `{ $pat }` is unbounded. Shortest path with an unbounded pattern may result in long execution times. Use an upper limit (e.g. `[*..5]`) on the number of node hops in your pattern.
Classification	`PERFORMANCE`
SeverityLevel	`INFORMATION`

Example 2. Shortest path with an unbounded pattern

Query

MATCH p=shortestPath((n)-[*]->(m))
WHERE n <> m
RETURN p

Description of the returned code

Using shortest path with an unbounded pattern will likely result in long execution times. It is recommended to use an upper limit to the number of node hops in your pattern.

Suggestions for improvement

If you have a big graph, this query might be very slow. Consider adding an upper limit.

MATCH p=shortestPath((n)-[*..8]->(m))
WHERE n <> m
RETURN p

Query

MATCH p=shortestPath((n)-[*]->(m))
WHERE n <> m
RETURN p

Returned GQLSTATUS code

03N91

Returned status description

info: unbounded variable length pattern. The provided pattern (n)-[*]→(m) is unbounded. Shortest path with an unbounded pattern may result in long execution times. Use an upper limit (e.g. [*..5]) on the number of node hops in your pattern.

Suggestions for improvement

If you have a big graph, this query might be very slow. Consider adding an upper limit.

MATCH p=shortestPath((n)-[*..8]->(m))
WHERE n <> m
RETURN p

Exhaustive shortest path

This notification is returned when a predicate, given on the shortest path, needs to inspect the whole path before deciding whether it is valid, the shortest path might fall back to the exhaustive search algorithm. For more information, see Cypher manual → Shortest path - additional predicate checks on the paths.

Table 3. Notification details
Neo4j code	`Neo.ClientNotification.Statement.ExhaustiveShortestPath`
Title	Exhaustive shortest path has been planned for your query that means that shortest path graph algorithm might not be used to find the shortest path. Hence an exhaustive enumeration of all paths might be used in order to find the requested shortest path.
Description	Using shortest path with an exhaustive search fallback might cause query slow down since shortest path graph algorithms might not work for this use case. It is recommended to introduce a `WITH` to separate the `MATCH` containing the shortest path from the existential predicates on that path.
Category	`PERFORMANCE`
GQLSTATUS code	`03N92`
Status description	info: exhaustive shortest path. The query runs with exhaustive shortest path due to the existential predicate(s) `{ $pred_list }`. It may be possible to use `WITH` to separate the `MATCH` from the existential predicate(s).
Classification	`PERFORMANCE`
SeverityLevel	`INFORMATION`

Example 3. A query that runs with an exhaustive shortest path

Query

MATCH p = shortestPath(()-[*..42]-())
WHERE ANY(n in nodes(p) WHERE n:Label)
RETURN p

Description of the returned code

Using shortest path with an exhaustive search fallback might cause query slow down since shortest path graph algorithms might not work for this use case. It is recommended to introduce a WITH to separate the MATCH containing the shortest path from the existential predicates on that path.

Suggestions for improvement

Separate the predicate by introducing a WITH after the MATCH clause.

MATCH p = shortestPath(()-[*..42]-())
WITH p
WHERE ANY(n in nodes(p) WHERE n:Label)
RETURN p

Query

MATCH p = shortestPath(()-[*..42]-())
WHERE ANY(n in nodes(p) WHERE n:Label)
RETURN p

Returned GQLSTATUS code

03N92

Returned status description

info: exhaustive shortest path. The query runs with exhaustive shortest path due to the existential predicate(s) ANY(n in nodes(p) WHERE n:Label). It may be possible to use WITH to separate the MATCH from the existential predicate(s).

Suggestions for improvement

Separate the predicate by introducing a WITH after the MATCH clause.

MATCH p = shortestPath(()-[*..42]-())
WITH p
WHERE ANY(n in nodes(p) WHERE n:Label)
RETURN p

No applicable index

This notification is returned when using LOAD CSV with a MATCH or a MERGE clause that matches a non-indexed label. This may not perform well on large data sets. Adding an index could improve the query speed.

Table 4. Notification details
Neo4j code	`Neo.ClientNotification.Statement.NoApplicableIndex`
Title	Adding a schema index may speed up this query.
Description	Using `LOAD CSV` followed by a `MATCH` or `MERGE` that matches a non-indexed label will most likely not perform well on large data sets. Please consider using a schema index.
Category	`PERFORMANCE`
GQLSTATUS code	`03N93`
Status description	info: no applicable index. `LOAD CSV` in combination with `MATCH` or `MERGE` on a label that does not have an index may result in long execution times. Consider adding an index for label `{ $label }`.
Classification	`PERFORMANCE`
SeverityLevel	`INFORMATION`

Example 4. LOAD CSV with MATCH or MERGE

Query

LOAD CSV FROM 'file:///ignore/ignore.csv' AS line WITH * MATCH (n:Person{name:line[0]}) RETURN line, n

Description of the returned code

Using LOAD CSV followed by a MATCH or MERGE that matches a non-indexed label will most likely not perform well on large data sets. Please consider using a schema index.

Suggestions for improvement

Create an index on the label and property you match.

CREATE INDEX FOR (n:Person) ON (n.name)

Query

LOAD CSV FROM 'file:///ignore/ignore.csv' AS line WITH * MATCH (n:Person{name:line[0]}) RETURN line, n

Returned GQLSTATUS code

03N93

Returned status description

info: no applicable index. LOAD CSV in combination with MATCH or MERGE on a label that does not have an index may result in long execution times. Consider adding an index for label Person.

Suggestions for improvement

Create an index on the label and property you match.

CREATE INDEX FOR (n:Person) ON (n.name)

Eager operator

This notification is returned when the execution plan for a query contains the Eager operator.

Table 5. Notification details
Neo4j code	`Neo.ClientNotification.Statement.EagerOperator`
Title	The execution plan for this query contains the Eager operator, which forces all dependent data to be materialized in main memory before proceeding
Description	Using `LOAD CSV` with a large data set in a query where the execution plan contains the Eager operator could potentially consume a lot of memory and is likely to not perform well. See the Neo4j Manual entry on the Eager operator for more information and hints on how problems could be avoided.
Category	`PERFORMANCE`
GQLSTATUS code	`03N94`
Status description	info: eager operator. The query execution plan contains the `Eager` operator. `LOAD CSV` in combination with `Eager` can consume a lot of memory.
Classification	`PERFORMANCE`
SeverityLevel	`INFORMATION`

Example 5. LOAD CSV with an Eager operator

LOAD CSV together with an Eager operator can take up a lot of memory.

Query

LOAD CSV FROM 'file:///ignore/ignore.csv' AS line MATCH (n:Person{name:line[0]}) DELETE n RETURN line

Description of the returned code

Using LOAD CSV with a large data set in a query where the execution plan contains the Eager operator could potentially consume a lot of memory and is likely to not perform well. See the Neo4j Manual entry on the Eager operator for more information and hints on how problems could be avoided.

Suggestions for improvement

See the Cypher Manual → Eager operator for more information and hints on how to avoid problems. In this specific case, the query could be rewritten to the following:

LOAD CSV FROM 'file:///ignore/ignore.csv' AS line
CALL {
    WITH line
    MATCH (n:Person{name:line[0]}) DELETE n
}
RETURN line

Query

LOAD CSV FROM 'file:///ignore/ignore.csv' AS line MATCH (n:Person{name:line[0]}) DELETE n RETURN line

Returned GQLSTATUS code

03N94

Returned status description

info: eager operator. The query execution plan contains the Eager operator. LOAD CSV in combination with Eager can consume a lot of memory.

Suggestions for improvement

See the Cypher Manual → Eager operator for more information and hints on how to avoid problems. In this specific case, the query could be rewritten to the following:

LOAD CSV FROM 'file:///ignore/ignore.csv' AS line
CALL {
    WITH line
    MATCH (n:Person{name:line[0]}) DELETE n
}
RETURN line

Dynamic property

Table 6. Notification details
Neo4j code	`Neo.ClientNotification.Statement.DynamicProperty`
Title	Queries using dynamic properties will use neither index seeks nor index scans for those properties
Description	Using a dynamic property makes it impossible to use an index lookup for this query (`%s`)
Category	`PERFORMANCE`
GQLSTATUS code	`03N95`
Status description	info: dynamic property. An index exists on label/type(s) `{ $label_list }`. It is not possible to use indexes for dynamic properties. Consider using static properties.
Classification	`PERFORMANCE`
SeverityLevel	`INFORMATION`

Example 6. A dynamic node property key makes it impossible to use indexes

Query

MATCH (n:Person) WHERE n[$prop] IS NOT NULL RETURN n;

Description of the returned code

Using a dynamic property makes it impossible to use an index lookup for this query (indexed label is: Person)

Suggestions for improvement

If there is an index for (n:Person) ON (n.name), it will not be used for the above query because the query is using a dynamic property. Therefore, if there is an index, it is better to use the constant value. For example, if prop is equal to name, the following query would be able to use the index:

MATCH (n:Person) WHERE n.name IS NOT NULL RETURN n;

Query

MATCH (n:Person) WHERE n[$prop] IS NOT NULL RETURN n;

Returned GQLSTATUS code

03N95

Returned status description

info: dynamic property. An index exists on label/type(s) Person. It is not possible to use indexes for dynamic properties. Consider using static properties.

Suggestions for improvement

MATCH (n:Person) WHERE n.name IS NOT NULL RETURN n;

Example 7. A dynamic relationship property key makes it impossible to use indexes

Query

MATCH ()-[r: KNOWS]->() WHERE r[$prop] IS NOT NULL RETURN r

Description of the returned code

Using a dynamic property makes it impossible to use an index lookup for this query (indexed type is: KNOWS)

Suggestions for improvement

Similar to dynamic node properties, use a constant value if possible, especially when there is an index on the relationship property. For example, if { $prop } is equal to since, you can rewrite the query to:

MATCH ()-[r: KNOWS]->() WHERE r.since IS NOT NULL RETURN r

Query

MATCH ()-[r: KNOWS]->() WHERE r[$prop] IS NOT NULL RETURN r

Returned GQLSTATUS code

03N95

Returned status description

info: dynamic property. An index exists on label/type(s) KNOWS. It is not possible to use indexes for dynamic properties. Consider using static properties.

Suggestions for improvement

MATCH ()-[r: KNOWS]->() WHERE r.since IS NOT NULL RETURN r

Failed code generation

The CodeGenerationFailed notification is created when it is not possible to generate a code for a query, for example, when the query is too big. For more information about the specific query, see the stack trace in the debug.log file.

Table 7. Notification details
Neo4j code	`Neo.ClientNotification.Statement.CodeGenerationFailed`
Title	The database was unable to generate code for the query. A stacktrace can be found in the debug.log.
Description	The database was unable to generate code for the query. A stacktrace can be found in the debug.log. (method too big)
Category	`PERFORMANCE`
GQLSTATUS code	`03N96`
Status description	info: failed code generation. Failed to generate code, falling back to interpreted $enginetype engine. A stacktrace can be found in the debug.log. Cause: $msg.
Classification	`PERFORMANCE`
SeverityLevel	`INFORMATION`

`HINT` notifications

HINT notifications are returned by default when the Cypher planner or runtime cannot create a query plan to fulfill a specified hint, for example, JOIN or INDEX. This behavior of the Cypher planner or runtime can be changed by setting the configuration dbms.cypher.hints_error to true. In this case, the query will return an error.

Join hint unfulfillable

Table 8. Notification details
Neo4j code	`Neo.ClientNotification.Statement.JoinHintUnfulfillableWarning`
Title	The database was unable to plan a hinted join.
Description	The hinted join was not planned. This could happen because no generated plan contained the join key, please try using a different join key or restructure your query. (`%s`)
Category	`HINT`
GQLSTATUS code	`01N30`
Status description	warn: join hint unfulfillable. Unable to create a plan with `JOIN ON $var_list`. Try to change the join key(s) or restructure your query.
Classification	`HINT`
SeverityLevel	`WARNING`

Example 8. Inability to fulfill the hint despite the given JOIN hint

Query

MATCH (a:A)
WITH a, 1 AS horizon
OPTIONAL MATCH (a)-[r]->(b:B)
USING JOIN ON a
OPTIONAL MATCH (a)--(c)
RETURN *

Description of the returned code

The hinted join was not planned. This could happen because no generated plan contained the join key, please try using a different join key or restructure your query. (hinted join key identifier is: a)

Suggestions for improvement

The JOIN hint cannot be applied because its specified variable is before the OPTIONAL MATCH and, therefore, is already bound. The only option for this query is to either remove the hint or modify the query to allow it to be used.

Query

MATCH (a:A)
WITH a, 1 AS horizon
OPTIONAL MATCH (a)-[r]->(b:B)
USING JOIN ON a
OPTIONAL MATCH (a)--(c)
RETURN *

Returned GQLSTATUS code

01N30

Returned status description

warn: joint hint unfulfillable. Unable to create a plan with JOIN ON a. Try to change the join key(s) or restructure your query.

Suggestions for improvement

Hinted index not found

Table 9. Notification details
Neo4j code	`Neo.ClientNotification.Schema.HintedIndexNotFound`
Title	The request (directly or indirectly) referred to an index that does not exist.
Description	The hinted index does not exist, please check the schema (`%s`)
Category	`HINT`
GQLSTATUS code	`01N31`
Status description	warn: hinted index not found. Unable to create a plan with `{ $index_descr }` because the index does not exist.
Classification	`HINT`
SeverityLevel	`WARNING`

Example 9. Inability to use the label index despite the given index hint

Query

MATCH (a: Label)
USING INDEX a:Label(id)
WHERE a.id = 1
RETURN a

Description of the returned code

The hinted index does not exist, please check the schema (index is: INDEX FOR (a:`Label`) ON (a.id))

Suggestions for improvement

The hinted index does not exist, make sure the label and property are spelled correctly. If the spelling is correct, either create the index or remove the hint from the query.

Query

MATCH (a: Label)
USING INDEX a:Label(id)
WHERE a.id = 1
RETURN a

Returned GQLSTATUS code

01N31

Returned status description

warn: hinted index not found. Unable to create a plan with INDEX :Label(id) because the index does not exist.

Suggestions for improvement

The hinted index does not exist, make sure the label and property are spelled correctly. If the spelling is correct, either create the index or remove the hint from the query.

Example 10. Inability to use the relationship index despite the given index hint

Query

MATCH ()-[r:Rel]-()
USING INDEX r:Rel(id)
WHERE r.id = 1
RETURN r

Description of the returned code

The hinted index does not exist, please check the schema (index is: INDEX FOR ()-[r:`Rel`]-() ON (r.id))

Suggestions for improvement

The hinted index does not exist, make sure the relationship type and property are spelled correctly. If the spelling is correct, either create the index or remove the hint from the query.

Query

MATCH ()-[r:Rel]-()
USING INDEX r:Rel(id)
WHERE r.id = 1
RETURN r

Returned GQLSTATUS code

01N31

Returned status description

warn: hinted index not found. Unable to create a plan with INDEX :Rel(id) because the index does not exist.

Suggestions for improvement

The hinted index does not exist, make sure the relationship type and property are spelled correctly. If the spelling is correct, either create the index or remove the hint from the query.

`UNRECOGNIZED` notifications

Unrecognized notifications are returned when the query or command mentions entities that are unknown to the system.

Home database not found

Table 10. Notification details
Neo4j code	`Neo.ClientNotification.Database.HomeDatabaseNotFound`
Title	The request referred to a home database that does not exist.
Description	The home database provided does not currently exist in the DBMS. This command will not take effect until this database is created. (`%s`)
Category	`UNRECOGNIZED`
GQLSTATUS code	`00N50`
Status description	note: successful completion - home database not found. The database `{ $db }` does not exist. Verify that the spelling is correct or create the database for the command to take effect.
Classification	`UNRECOGNIZED`
SeverityLevel	`INFORMATION`

Example 11. Setting the home database to a database that does not exist

Query

CREATE USER john SET PASSWORD "secret" SET HOME DATABASE nej4

Description of the returned code

The home database provided does not currently exist in the DBMS. This command will not take effect until this database is created. (HOME DATABASE: nej4)

Suggestions for improvement

Verify that the home database name is not misspelled.

Query

CREATE USER john SET PASSWORD "secret" SET HOME DATABASE nej4

Returned GQLSTATUS code

00N50

Returned status description

note: successful completion - home database not found. The database ne4j does not exist. Verify that the spelling is correct or create the database for the command to take effect.

Suggestions for improvement

Verify that the home database name is not misspelled.

Unknown label

Table 11. Notification details
Neo4j code	`Neo.ClientNotification.Statement.UnknownLabelWarning`
Title	The provided label is not in the database.
Description	One of the labels in your query is not available in the database, make sure you didn’t misspell it or that the label is available when you run this statement in your application (`%s`)
Category	`UNRECOGNIZED`
GQLSTATUS code	`01N50`
Status description	warn: unknown label. The label `{ $label }` does not exist. Verify that the spelling is correct.
Classification	`UNRECOGNIZED`
SeverityLevel	`WARNING`

Example 12. Matching on a node with a label that does not exist in the database

Query

MATCH (n:Perso) RETURN n

Description of the returned code

One of the labels in your query is not available in the database, make sure you didn’t misspell it or that the label is available when you run this statement in your application (the missing label name is: Perso)

Suggestions for improvement

Verify that the label is not misspelled. If you plan to create nodes with that label in the future, then no change is needed.

Query

MATCH (n:Perso) RETURN n

Returned GQLSTATUS code

01N50

Returned status description

warn: unknown label. The label Perso does not exist. Verify that the spelling is correct.

Suggestions for improvement

Verify that the label is not misspelled. If you plan to create nodes with that label in the future, no change is needed.

Unknown relationship type

Table 12. Notification details
Neo4j code	`Neo.ClientNotification.Statement.UnknownRelationshipTypeWarning`
Title	The provided relationship type is not in the database.
Description	One of the relationship types in your query is not available in the database, make sure you didn’t misspell it or that the label is available when you run this statement in your application (`%s`)
Category	`UNRECOGNIZED`
GQLSTATUS code	`01N51`
Status description	warn: unknown relationship type. The relationship type `{ $reltype }` does not exist. Verify that the spelling is correct.
Classification	`UNRECOGNIZED`
SeverityLevel	`WARNING`

Example 13. Matching a relationship with a type that does not exist

Query

MATCH (n)-[:NonExistingType]->() RETURN n

Description of the returned code

One of the relationship types in your query is not available in the database, make sure you didn’t misspell it or that the label is available when you run this statement in your application (the missing relationship type is: NonExistingType)

Suggestions for improvement

Verify that the relationship type is not misspelled. If you plan to create relationships of this type in the future, no change is needed.

Query

MATCH (n)-[:NonExistingType]->() RETURN n

Returned GQLSTATUS code

01N51

Returned status description

warn: unknown relationship type. The relationship type NonExistingType does not exist. Verify that the spelling is correct.

Suggestions for improvement

Verify that the relationship type is not misspelled. If you plan to create relationships of this type in the future, no change is needed.

Unknown property key

Table 13. Notification details
Neo4j code	`Neo.ClientNotification.Statement.UnknownPropertyKeyWarning`
Title	The provided property key is not in the database
Description	One of the property names in your query is not available in the database, make sure you didn’t misspell it or that the label is available when you run this statement in your application (`%s`)
Category	`UNRECOGNIZED`
GQLSTATUS code	`01N52`
Status description	warn: unknown property key. The property `{ $propkey }` does not exist. Verify that the spelling is correct.
Classification	`UNRECOGNIZED`
SeverityLevel	`WARNING`

Example 14. Matching a property key that does not exist

Query

MATCH (n:Person {nme:”Tom”})
RETURN n

Description of the returned code

One of the property names in your query is not available in the database, make sure you didn’t misspell it or that the label is available when you run this statement in your application (the missing property name is: nme)

Suggestions for improvement

Verify that the property key is not misspelled. If you plan to create that property key in the future, no change is needed.

Query

MATCH (n:Person {nme:”Tom”})
RETURN n

Returned GQLSTATUS code

01N52

Returned status description

warn: unknown property key. The property nme does not exist. Verify that the spelling is correct.

Suggestions for improvement

Verify that the property key is not misspelled. If you plan to create that property key in the future, no change is needed.

Aggregation skipped null

Table 14. Notification details
Neo4j code	`Neo.ClientNotification.Statement.AggregationSkippedNull`
Title	The query contains an aggregation function that skips null values.
Description	The query contains an aggregation function that skips null values.
Category	`UNRECOGNIZED`
GQLSTATUS code	`01G11`
Status description	warn: null value eliminated in set function.
Classification	`UNRECOGNIZED`
SeverityLevel	`WARNING`

Example 15. Aggregation skipping a NULL value

Query

UNWIND [1, NULL, 2] AS i RETURN count(i) AS sum

Description of the returned code: The query contains an aggregation function that skips null values.

Query

UNWIND [1, NULL, 2] AS i RETURN count(i) AS sum

Returned GQLSTATUS code

01G11

Returned status description

warn: null value eliminated in set function.

`UNSUPPORTED` category

Unsupported notifications are returned when the query or command is trying to use features that are not supported by the current system or using experimental features that should not be used in production.

Unsupported runtime

Table 15. Notification details
Neo4j code	`Neo.ClientNotification.Statement.RuntimeUnsupportedWarning`
Title	This query is not supported by the chosen runtime.
Description	Selected runtime is unsupported for this query, please use a different runtime instead or fallback to default. (`%s`)
Category	`UNSUPPORTED`
GQLSTATUS code	`01N40`
Status description	warn: unsupported runtime. The query cannot be executed with `{ $preparser_input1 }`, `{ $preparser_input2 }` is used. Cause: `{ $msg }`.
Classification	`UNSUPPORTED`
SeverityLevel	`WARNING`

Example 16. A runtime is not supported by a Cypher command

Query

CYPHER runtime=pipelined SHOW INDEXES YIELD *

Description of the returned code

Selected runtime is unsupported for this query, please use a different runtime instead or fallback to default. (Pipelined does not yet support the plans including ShowIndexes, use another runtime.)

Suggestions for improvement

Use a different runtime or remove the runtime option to run the query with the default runtime:

SHOW INDEXES YIELD *

Query

EXPLAIN CYPHER runtime=pipelined SHOW INDEXES YIELD *

Returned GQLSTATUS code

01N40

Returned status description

warn: unsupported runtime. The query cannot be executed with runtime=pipelined, runtime=slotted is used. Cause: Pipelined does not yet support the plans including ShowIndexes, use another runtime.

Suggestions for improvement

Use a different runtime or remove the runtime option to run the query with the default runtime:

SHOW INDEXES YIELD *

RuntimeExperimental

The usage of this notification has been removed since Neo4j 5.14.

Table 16. Notification details
Neo4j code	`Neo.ClientNotification.Statement.RuntimeExperimental`
Title	This feature is experimental and should not be used in production systems.
Description	You are using an experimental feature (`%s`)
Category	`UNSUPPORTED`
SeverityLevel	`WARNING`

Example 17. Use of the parallel runtime

Query

CYPHER runtime=parallel MATCH (n) RETURN (n)

Description of the returned code

You are using an experimental feature (The parallel runtime is experimental and might suffer from instability and potentially correctness issues.)

Suggestions for improvement

The parallel runtime should not be used in production. Choose another runtime or remove the option to use the default runtime:

MATCH (n) RETURN (n)

`DEPRECATION` notifications

Deprecation notifications contain information about a feature or functionality that has been deprecated. It is important to change to the new functionality, otherwise, the query might break in a future version.

Feature deprecated

Table 17. Notification details
Neo4j code	`Neo.ClientNotification.Statement.FeatureDeprecationWarning`
Title	This feature is deprecated and will be removed in future versions.
Descriptions	The procedure has a deprecated field. (`%s`) The function has a deprecated field. (`%s`) Creating an entity (`%s`) and referencing that entity in a property definition in the same CREATE is deprecated. Merging an entity (`%s`) and referencing that entity in a property definition in the same MERGE is deprecated. The Unicode character `%s` is deprecated for unescaped identifiers and will be considered as a whitespace character in the future. To continue using it, escape the identifier by adding backticks around the identifier `%s`. The character with the Unicode representation `%s` is deprecated for unescaped identifiers and will not be supported in the future. To continue using it, escape the identifier by adding backticks around the identifier `%s`. All subqueries in a UNION [ALL] should have the same ordering for the return columns. Using differently ordered return items in a UNION [ALL] clause is deprecated and will be removed in a future version. Databases and aliases with unescaped `.` are deprecated unless to indicate that they belong to a composite database. Names containing `.` should be escaped. (`%s`)
Category	`DEPRECATION`
GQLSTATUS code	`01N00`
Status description	warn: feature deprecated. $msg
Classification	`DEPRECATION`
SeverityLevel	`WARNING`

Example 18. Create a database with an unescaped name containing a dot

Query

CREATE DATABASE foo.bar

Description of the returned code

Databases and aliases with unescaped . are deprecated unless to indicate that they belong to a composite database. Names containing . should be escaped. (Name: foo.bar)

Suggestions for improvement

If not intended for a composite database, escape the name with the character `.

CREATE DATABASE `foo.bar`

Query

CREATE DATABASE foo.bar

Returned GQLSTATUS code

01N00

Returned status description

warn: feature deprecated. Databases and aliases with unescaped . are deprecated unless to indicate that they belong to a composite database. Names containing . should be escaped. (Name: foo.bar)

Suggestions for improvement

If not intended for a composite database, escape the name with the character `.

CREATE DATABASE `foo.bar`

Example 19. Using differently ordered return items in a UNION clause

Query

RETURN 'val' as one, 'val' as two
UNION
RETURN 'val' as two, 'val' as one

Description of the returned code

All subqueries in a UNION [ALL] should have the same ordering for the return columns. Using differently ordered return items in a UNION [ALL] clause is deprecated and will be removed in a future version.

Suggestions for improvement

Use the same order for the return columns in all subqueries combined by a UNION clause.

RETURN 'val' as one, 'val' as two
UNION
RETURN 'val' as one, 'val' as two

Query

RETURN 'val' as one, 'val' as two
UNION
RETURN 'val' as two, 'val' as one

Returned GQLSTATUS code

01N00

Returned status description

warn: feature deprecated. All subqueries in a UNION [ALL] should have the same ordering for the return columns. Using differently ordered return items in a UNION [ALL] clause is deprecated and will be removed in a future version.

Suggestions for improvement

Use the same order for the return columns in all subqueries combined by a UNION clause.

RETURN 'val' as one, 'val' as two
UNION
RETURN 'val' as one, 'val' as two

Example 20. Using the Unicode \u0085 in an unescaped identifier

Query

RETURN 1 as my\u0085identifier

Description of the returned code

The Unicode character \u0085 is deprecated for unescaped identifiers and will be considered as a whitespace character in the future. To continue using it, escape the identifier by adding backticks around the identifier my\u0085identifier.

Query

RETURN 1 as my\u0085identifier

Returned GQLSTATUS code

01N00

Returned status description

warn: feature deprecated. The Unicode character \u0085 is deprecated for unescaped identifiers and will be considered as a whitespace character in the future. To continue using it, escape the identifier by adding backticks around the identifier my\u0085identifier.

Feature deprecated with a replacement

Table 18. Notification details
Neo4j code	`Neo.ClientNotification.Statement.FeatureDeprecationWarning`
Title	This feature is deprecated and will be removed in future versions.
Descriptions	The semantics of using colon in the separation of alternative relationship types will change in a future version. (`%s`) The use of nodes or relationships for setting properties is deprecated and will be removed in a future version. Please use properties() instead. The use of shortestPath and allShortestPaths with fixed length relationships is deprecated and will be removed in a future version. Please use a path with a length of 1 [r*1..1] instead or a Match with a limit. The query used a deprecated function. (`%s`) The query used a deprecated procedure. (`%s`) The query used a deprecated runtime option. (`%s`) The `TextIndexProvider.DESCRIPTOR.name()` provider for text indexes is deprecated and will be removed in a future version. Please use `TrigramIndexProvider.DESCRIPTOR.name()` instead.
Category	`DEPRECATION`
GQLSTATUS code	`01N01`
Status description	warn: feature deprecated with replacement. `{ $thing1 }` is deprecated. It is replaced by `{ $thing2 }`.
Classification	`DEPRECATION`
SeverityLevel	`WARNING`

Example 21. Colon after the vertical bar |: in a relationship pattern

Query

MATCH (a)-[:A|:B|:C]-() RETURN *

Description of the returned code

The semantics of using colon in the separation of alternative relationship types will change in a future version. (Please use ':A|B|C' instead)

Suggestions for improvement

Remove the colon inside the relationship type expression.

MATCH (a)-[:A|B|C]-() RETURN *

Query

MATCH (a)-[:A|:B|:C]-() RETURN *

Returned GQLSTATUS code

01N01

Returned status description

warn: feature deprecated with replacement. :A|:B|:C is deprecated. It is replaced by :A|B|C.

Suggestions for improvement

Remove the colon inside the relationship type expression.

MATCH (a)-[:A|B|C]-() RETURN *

Example 22. Setting properties using a node

Query

MATCH (a)-[]-(b)
SET a = b

Description of the returned code

The use of nodes or relationships for setting properties is deprecated and will be removed in a future version. Please use properties() instead.

Suggestions for improvement

Use the properties() function to get all properties from b.

MATCH (a)-[]-(b)
SET a = properties(b)

Query

MATCH (a)-[]-(b)
SET a = b

Returned GQLSTATUS code

01N01

Returned status description

warn: feature deprecated with replacement. SET a = b is deprecated. It is replaced by SET a = properties(b).

Suggestions for improvement

Use the properties() function to get all properties from b.

MATCH (a)-[]-(b)
SET a = properties(b)

Example 23. Setting properties using a relationship

Query

MATCH (a)-[r]-(b)
SET a += r

Description of the returned code

The use of nodes or relationships for setting properties is deprecated and will be removed in a future version. Please use properties() instead.

Suggestions for improvement

Use the properties() function to get all properties from r.

MATCH (a)-[r]-(b)
SET a += properties(r)

Query

MATCH (a)-[r]-(b)
SET a += r

Returned GQLSTATUS code

01N01

Returned status description

warn: feature deprecated with replacement. SET a += r is deprecated. It is replaced by SET a += properties(r).

Suggestions for improvement

Use the properties() function to get all properties from r.

MATCH (a)-[r]-(b)
SET a += properties(r)

Example 24. Shortest path with a fixed relationship length

Query

MATCH (a:Start), shortestPath((a)-[r]->()) RETURN a

Description of the returned code

The use of shortestPath and allShortestPaths with fixed length relationships is deprecated and will be removed in a future version. Please use a path with a length of 1 [r*1..1] instead or a Match with a limit.

Suggestions for improvement

If the relationship length is fixed, there is no reason to search for the shortest path. Instead, you can rewrite it to the following:

MATCH (a: Start)-[r]->(b: End) RETURN b LIMIT 1

Query

MATCH (a:Start), shortestPath((a)-[r]->()) RETURN a

Returned GQLSTATUS code

01N01

Returned status description

warn: feature deprecated with replacement. shortestPath((a)-[r]→()) is deprecated. It is replaced by shortestPath((n)-[r*1..1]→(m)).

Suggestions for improvement

If the relationship length is fixed, there is no reason to search for the shortest path. Instead, you can rewrite it to the following:

MATCH (a: Start)-[r]->(b: End) RETURN b LIMIT 1

Example 25. Using a deprecated runtime option

Query

CYPHER runtime = interpreted MATCH (n) RETURN n

Description of the returned code

The query used a deprecated runtime option. ('runtime=interpreted' is deprecated, please use 'runtime=slotted' instead)

Suggestions for improvement

Runtime interpreted is deprecated and another runtime is used instead. Alternatively, you can remove the runtime option to use the default runtime.

MATCH (n) RETURN n

Query

CYPHER runtime = interpreted MATCH (n) RETURN n

Returned GQLSTATUS code

01N01

Returned status description

warn: feature deprecated with replacement. runtime=interpreted is deprecated. It is replaced by runtime=slotted.

Suggestions for improvement

Runtime interpreted is deprecated and another runtime is used instead. Alternatively, you can remove the runtime option to use the default runtime.

MATCH (n) RETURN n

Example 26. Using the text-1.0 index provider when creating a text index

Query

CREATE TEXT INDEX FOR (n:Label) ON (n.prop) OPTIONS {indexProvider : 'text-1.0'}

Description of the returned code

The text-1.0 provider for text indexes is deprecated and will be removed in a future version. Please use text-2.0 instead.

Suggestions for improvement

Update the option indexProvider with the value text-2.0.

CREATE TEXT INDEX FOR (n:Label) ON (n.prop) OPTIONS {indexProvider : 'text-2.0'}

Query

CREATE TEXT INDEX FOR (n:Label) ON (n.prop) OPTIONS {indexProvider : 'text-1.0'}

Returned GQLSTATUS code

01N01

Returned status description

warn: feature deprecated with replacement. text-1.0 is deprecated. It is replaced by text-2.0.

Suggestions for improvement

Update the option indexProvider with the value text-2.0.

CREATE TEXT INDEX FOR (n:Label) ON (n.prop) OPTIONS {indexProvider : 'text-2.0'}

Example 27. Using a renamed or a deprecated procedure

CALL unsupported.dbms.shutdown

Description of the returned code: The query used a deprecated procedure: 'unsupported.dbms.shutdown'.
Suggestions for improvement: Remove the use of the deprecated procedure. If there is a suggested replacement, update to use the replacement instead.

CALL cdc.query

Returned GQLSTATUS code: 01N01
Returned status description: warn: feature deprecated with replacement. cdc.query is deprecated. It is replaced by db.cdc.query.

CALL unsupported.dbms.shutdown

Returned GQLSTATUS code: 01N02
Returned status description: warn: feature deprecated without replacement. unsupported.dbms.shutdown is deprecated and will be removed without a replacement.

Example 28. Using id() function

Query

MATCH (a)
RETURN id(a)

Description of the returned code

The query used a deprecated function: id.

Suggestions for improvement

Use the function elementId() instead.

MATCH (a)
RETURN elementId(a)

Query

MATCH (a)
RETURN id(a)

Returned GQLSTATUS code

01N01

Returned status description

warn: feature deprecated with replacement. id is deprecated. It is replaced by elementId().

Suggestions for improvement

Use the function elementId() instead.

MATCH (a)
RETURN elementId(a)

Query

MATCH (a)
RETURN id(a)

Returned GQLSTATUS code

01N02

Returned status description

warn: feature deprecated without replacement. id is deprecated and will be removed without a replacement.

Deprecated features without a future replacement

Table 19. Notification details
Neo4j code	`Neo.ClientNotification.Statement.FeatureDeprecationWarning`
Title	This feature is deprecated and will be removed in future versions.
Descriptions	The Cypher query option `connectComponentsPlanner` is deprecated and will be removed without a replacement. The product’s default behavior of using a cost-based IDP search algorithm when combining sub-plans will be kept. For more information, see Cypher Manual → Cypher planner. The query used a deprecated function%s The query used a deprecated procedure%s
Category	`DEPRECATION`
GQLSTATUS code	`01N02`
Status description	warn: feature deprecated without replacement. `{ $thing }` is deprecated and will be removed without a replacement.
Classification	`DEPRECATION`
SeverityLevel	`WARNING`

Example 29. Using Cypher query option connectComponentsPlanner

Query

CYPHER connectComponentsPlanner=greedy MATCH (a), (b) RETURN *

Description of the returned code

The Cypher query option connectComponentsPlanner is deprecated and will be removed without a replacement. The product’s default behavior of using a cost-based IDP search algorithm when combining sub-plans will be kept. For more information, see Cypher manual → Cypher planner.

Query

CYPHER connectComponentsPlanner=greedy MATCH (a), (b) RETURN *

Returned GQLSTATUS code

01N02

Returned status description

warn: feature deprecated without replacement. connectComponentsPlanner is deprecated and will be removed without a replacement.

Procedure field deprecated

Table 20. Notification details
Neo4j code	`Neo.ClientNotification.Statement.FeatureDeprecationWarning`
Title	This feature is deprecated and will be removed in future versions.
Description	The query used a deprecated field from a procedure. (`%s`)
Category	`DEPRECATION`
GQLSTATUS code	`01N03`
Status description	warn: procedure field deprecated. `{ $field }` for procedure `{ $proc }` is deprecated.
Classification	`DEPRECATION`
SeverityLevel	`WARNING`

Feature deprecated with replacement - DeprecatedFormat

Table 21. Notification details
Neo4j code	`Neo.ClientNotification.Request.DeprecatedFormat`
Title	The client made a request for a format which has been deprecated.
Description	The requested format has been deprecated. (`%s`)
Category	`DEPRECATION`
GQLSTATUS code	`01N01`
Status description	warn: feature deprecated with replacement. `{ $thing1 }` is deprecated. It is replaced by `{ $thing2 }`.
Classification	`DEPRECATION`
SeverityLevel	`WARNING`

`SECURITY` category

Security notifications indicate that the result of the query or command might have a potential security issue. Verify that this is the intended behavior of your query or command.

Role or privilege not assigned

Table 22. Notification details
Neo4j code	`Neo.ClientNotification.Security.CommandHasNoEffect`
Title	`<command>` has no effect.*
Descriptions	The user does not have the role. See Status Codes documentation for more information. The role does not have the privilege. See Status Codes documentation for more information.
Category	`SECURITY`
GQLSTATUS code	`00N71`
Status description	note: successful completion - role or privilege not assigned. `{ $cmd }` has no effect. The role or privilege is not assigned.
Classification	`SECURITY`
SeverityLevel	`INFORMATION`

*<command> and cmd could be either the full command given by the user or a subset of the given command.

Example 30. Revoking a role from a user who does not have that role

Command

REVOKE ROLE admin, reader FROM jane

Title of the returned code

REVOKE ROLE reader FROM jane has no effect.

Description of the returned code

The user does not have the role. See Status Codes documentation for more information.

Suggestions for improvement

Verify that this is the intended role and user.

Command

REVOKE ROLE admin, reader FROM jane

Returned GQLSTATUS code

00N71

Returned status description

note: successful completion - role or privilege not assigned. REVOKE ROLE reader FROM jane has no effect. The role or privilege is not assigned.

Suggestions for improvement

Verify that this is the intended role and user.

Example 31. Revoking a privilege from a role that does not have that privilege

Command

REVOKE WRITE ON GRAPH * FROM reader

Title of the returned code

REVOKE DENY WRITE ON GRAPH * FROM reader has no effect.

Description of the returned code

The role does not have the privilege. See Status Codes documentation for more information.

Suggestions for improvement

Verify that this is the intended privilege and role.

Command

REVOKE WRITE ON GRAPH * FROM reader

Returned GQLSTATUS code

00N71

Returned status description

note: successful completion - role or privilege not assigned. REVOKE DENY WRITE ON GRAPH * FROM reader has no effect. The role or privilege is not assigned.

Suggestions for improvement

Verify that this is the intended privilege and role.

Role or privilege already assigned

Table 23. Notification details
Neo4j code	`Neo.ClientNotification.Security.CommandHasNoEffect`
Title	`<command>` has no effect.*
Descriptions	The user already has the role. See Status Codes documentation for more information. The role already has the privilege. See Status Codes documentation for more information.
Category	`SECURITY`
GQLSTATUS code	`00N70`
Status description	note: successful completion - role or privilege already assigned. `{ $cmd }` has no effect. The role or privilege is already assigned.
Classification	`SECURITY`
SeverityLevel	`INFORMATION`

*<command> and cmd could be either the full command given by the user or a subset of the given command.

Example 32. Granting a role to a user who already has that role

Command

GRANT ROLE admin TO john

Title of the returned code

GRANT ROLE admin TO john has no effect.

Description of the returned code

The user already has the role. See Status Codes documentation for more information.

Suggestions for improvement

Verify that this is the intended role and user.

Command

GRANT ROLE admin TO john

Returned GQLSTATUS code

00N70

Returned status description

note: successful completion - role or privilege already assigned. GRANT ROLE admin TO john has no effect. The role or privilege is already assigned.

Suggestions for improvement

Verify that this is the intended role and user.

Example 33. Granting or denying a privilege to a role that already has that privilege

Command

GRANT TRAVERSE ON GRAPH * TO reader

Title of the returned code

GRANT TRAVERSE ON GRAPH * NODE * TO reader has no effect.

Description of the returned code

The role already has the privilege. See Status Codes documentation for more information.

Suggestions for improvement

Verify that this is the intended privilege and role.

Command

GRANT TRAVERSE ON GRAPH * TO reader

Returned GQLSTATUS code

00N70

Returned status description

note: successful completion - role or privilege already assigned. GRANT TRAVERSE ON GRAPH * TO reader has no effect. The role or privilege is already assigned.

Suggestions for improvement

Verify that this is the intended privilege and role.

Impossible revoke command

Table 24. Notification details
Neo4j code	`Neo.ClientNotification.Security.ImpossibleRevokeCommand`
Title	`<command>` has no effect.*
Description	Role does not exist. Make sure nothing is misspelled. This notification will become an error in a future major version. See Status Codes documentation for more information.
Category	`SECURITY`
GQLSTATUS code	`01N70`
Status description	warn: impossible revoke command. `cmd` has no effect. $msg Make sure nothing is misspelled. This notification will become an error in a future major version.
Classification	`SECURITY`
SeverityLevel	`WARNING`

*<command> and cmd could be either the full command given by the user or a subset of the given command.

Example 34. Revoking a non-existing role from a user

Command

REVOKE ROLE manager, reader FROM jane

Title of the returned code

REVOKE ROLE manager FROM jane has no effect.

Description of the returned code

Role does not exist. Make sure nothing is misspelled. This notification will become an error in a future major version. See Status Codes documentation for more information.

Suggestions for improvement

Verify that this is the intended role and that it is spelled correctly.

Command

REVOKE ROLE manager, reader FROM jane

Returned GQLSTATUS code

01N70

Returned status description

warn: impossible revoke command. REVOKE ROLE manager FROM jane has no effect. Role does not exist. Make sure nothing is misspelled. This notification will become an error in a future major version.

Suggestions for improvement

Verify that this is the intended role and that it is spelled correctly.

Example 35. Revoking a role from a non-existing user

Command

REVOKE ROLE reader FROM alice

Title of the returned code

REVOKE ROLE reader FROM alice has no effect.

Description of the returned code

User does not exist. Make sure nothing is misspelled. This notification will become an error in a future major version.

Suggestions for improvement

Verify that this is the intended user and that it is spelled correctly.

Command

REVOKE ROLE reader FROM alice

Returned GQLSTATUS code

01N70

Returned status description

warn: impossible revoke command. REVOKE ROLE reader FROM alice has no effect. User does not exist. Make sure nothing is misspelled. This notification will become an error in a future major version. See Status Codes documentation for more information. o

Suggestions for improvement

Verify that this is the intended user and that it is spelled correctly.

Example 36. Revoking a privilege from a non-existing role

Command

REVOKE GRANT WRITE ON GRAPH * FROM manager

Title of the returned code

REVOKE GRANT WRITE ON GRAPH * FROM manager has no effect.

Description of the returned code

Role does not exist. Make sure nothing is misspelled. This notification will become an error in a future major version. See Status Codes documentation for more information.

Suggestions for improvement

Verify that this is the intended role and that it is spelled correctly.

Command

REVOKE GRANT WRITE ON GRAPH * FROM manager

Returned GQLSTATUS code

01N70

Returned status description

warn: impossible revoke command. REVOKE GRANT WRITE ON GRAPH * FROM manager has no effect. Role does not exist. Make sure nothing is misspelled. This notification will become an error in a future major version.

Suggestions for improvement

Verify that this is the intended role and that it is spelled correctly.

Example 37. Revoking a privilege on a non-existing graph from a role

Command

REVOKE GRANT WRITE ON GRAPH neo3j FROM editor

Title of the returned code

REVOKE GRANT WRITE ON GRAPH neo3j FROM editor has no effect.

Description of the returned code

Database neo3j does not exist. Make sure nothing is misspelled. This notification will become an error in a future major version. See Status Codes documentation for more information.

Suggestions for improvement

Verify that this is the intended graph and that it is spelled correctly.

Command

REVOKE GRANT WRITE ON GRAPH neo3j FROM editor

Returned GQLSTATUS code

01N70

Returned status description

warn: impossible revoke command. REVOKE GRANT WRITE ON GRAPH neo3j FROM editor has no effect. Database neo3j does not exist. Make sure nothing is misspelled. This notification will become an error in a future major version.

Suggestions for improvement

Verify that this is the intended graph and that it is spelled correctly.

Example 38. Revoking a privilege on a non-existing database from a role

Command

REVOKE GRANT ACCESS ON DATABASE neo3j FROM editor

Title of the returned code

REVOKE GRANT ACCESS ON DATABASE neo3j FROM editor has no effect.

Description of the returned code

Database neo3j does not exist. Make sure nothing is misspelled. This notification will become an error in a future major version. See Status Codes documentation for more information.

Suggestions for improvement

Verify that this is the intended database and that it is spelled correctly.

Command

REVOKE GRANT ACCESS ON DATABASE neo3j FROM editor

Returned GQLSTATUS code

01N70

Returned status description

warn: impossible revoke command. REVOKE GRANT ACCESS ON DATABASE neo3j FROM editor has no effect. Database neo3j does not exist. Make sure nothing is misspelled. This notification will become an error in a future major version.

Suggestions for improvement

Verify that this is the intended database and that it is spelled correctly.

Example 39. Revoking a privilege from a role with wildcard graph parameter

Parameter

{
    "graph": "*"
}

Command

REVOKE GRANT CREATE ON GRAPH $graph FROM PUBLIC

Title of the returned code

REVOKE GRANT CREATE ON GRAPH $graph FROM PUBLIC has no effect.

Description of the returned code

Parameterized database and graph names do not support wildcards. Make sure nothing is misspelled. This notification will become an error in a future major version. See Status Codes documentation for more information.

Suggestions for improvement

Use GRAPH * without the parameter to revoke the privilege on all graphs.

Parameter

{
    "graph": "*"
}

Command

REVOKE GRANT CREATE ON GRAPH $graph FROM PUBLIC

Returned GQLSTATUS code

01N70

Returned status description

warn: impossible revoke command. REVOKE GRANT CREATE ON GRAPH $graph FROM PUBLIC has no effect. Database * does not exist. Make sure nothing is misspelled. This notification will become an error in a future major version.

Suggestions for improvement

Use GRAPH * without the parameter to revoke the privilege on all graphs.

Example 40. Revoking a privilege from a role with a wildcard database parameter

Parameter

{
    "database": "*"
}

Command

REVOKE GRANT ACCESS ON DATABASE $database FROM PUBLIC

Title of the returned code

REVOKE GRANT ACCESS ON DATABASE $database FROM PUBLIC has no effect.

Description of the returned code

Suggestions for improvement

Use DATABASE * without the parameter to revoke the privilege on all databases.

Parameter

{
    "database": "*"
}

Command

REVOKE GRANT ACCESS ON DATABASE $database FROM PUBLIC

Returned GQLSTATUS code

01N70

Returned status description

warn: impossible revoke command. REVOKE GRANT ACCESS ON DATABASE $database FROM PUBLIC has no effect. Database * does not exist. Make sure nothing is misspelled. This notification will become an error in a future major version.

Suggestions for improvement

Use DATABASE * without the parameter to revoke the privilege on all databases.

AuthProviderNotDefined

Table 25. Notification details
Neo4j code	`Neo.ClientNotification.Security.AuthProviderNotDefined`
Title	The auth provider is not defined.
Description	The auth provider `{ $provider }` is not defined in the configuration. Verify that the spelling is correct or define `{ $provider }` in the configuration.
Category	`SECURITY`
GQLSTATUS code	`00N72`
Status description	note: successful completion - undefined auth provider. The auth provider { $auth } is not defined in the configuration. Verify that the spelling is correct or define { $auth } in the configuration.
Classification	`SECURITY`
SeverityLevel	`INFORMATION`

Example 41. Create a user with an auth provider that is not defined in the configuration

Command

CREATE USER foo SET AUTH 'unknownProvider' { SET ID 'idString' }

Description of the returned code

The auth provider unknownProvider is not defined in the configuration. Verify that the spelling is correct or define unknownProvider in the configuration.

Suggestions for improvement

Make sure that the given provider is correct, or replace it if not. If it is correct, make sure to add it as a known auth provider in one or both of dbms.security.authentication_providers and dbms.security.authorization_providers.

Command

CREATE USER foo SET AUTH 'unknownProvider' { SET ID 'idString' }

Returned GQLSTATUS code

00N72

Returned status description

note: successful completion - undefined auth provider. The auth provider unknownProvider is not defined in the configuration. Verify that the spelling is correct or define unknownProvider in the configuration.

Suggestions for improvement

Example 42. Alter a user to add an auth provider that is not defined in the configuration

Command

ALTER USER foo SET AUTH 'unknownProvider' { SET ID 'idString' }

Description of the returned code

The auth provider unknownProvider is not defined in the configuration. Verify that the spelling is correct or define unknownProvider in the configuration.

Suggestions for improvement

Command

ALTER USER foo SET AUTH 'unknownProvider' { SET ID 'idString' }

Returned GQLSTATUS code

00N72

Returned status description

Suggestions for improvement

ExternalAuthNotEnabled

Table 26. Notification details
Neo4j code	`Neo.ClientNotification.Security.ExternalAuthNotEnabled`
Title	External auth for user is not enabled.
Description	Use setting `dbms.security.require_local_user` to enable external auth.
Category	`SECURITY`
GQLSTATUS code	`01N71`
Status description	warn: external auth disabled. Use the setting 'dbms.security.require_local_user' to enable external auth.
Classification	`SECURITY`
SeverityLevel	`WARNING`

Example 43. Create a user with an external auth provider when linked users are not enabled

Command

CREATE USER foo SET AUTH 'exampleProvider' { SET ID 'idString' }

Suggestions for improvement

Enable linked users through the dbms.security.require_local_user setting. Until enabled, the new external auth will be ignored, and current external auth behaviors will continue to apply.

Command

CREATE USER foo SET AUTH 'exampleProvider' { SET ID 'idString' }

Returned GQLSTATUS code

01N71

Returned status description

warn: external auth disabled. Use the setting 'dbms.security.require_local_user' to enable external auth.

Suggestions for improvement

Enable linked users through the dbms.security.require_local_user setting. Until enabled, the new external auth will be ignored, and current external auth behaviors will continue to apply.

Example 44. Alter a user to add an external auth provider when linked users are not enabled

Command

ALTER USER foo SET AUTH 'exampleProvider' { SET ID 'idString' }

Suggestions for improvement

Enable linked users through the dbms.security.require_local_user setting. Until enabled, the new external auth will be ignored, and current external auth behaviors will continue to apply.

Command

ALTER USER foo SET AUTH 'exampleProvider' { SET ID 'idString' }

Returned GQLSTATUS code

01N71

Returned status description

warn: external auth disabled. Use the setting 'dbms.security.require_local_user' to enable external auth.

Suggestions for improvement

Enable linked users through the dbms.security.require_local_user setting. Until enabled, the new external auth will be ignored, and current external auth behaviors will continue to apply.

`TOPOLOGY` category

Topology notifications provide additional information related to managing databases and servers.

Server already enabled

Table 27. Notification details
Neo4j code	`Neo.ClientNotification.Cluster.ServerAlreadyEnabled`
Title	`<command>` has no effect.
Description	Server `%s` is already enabled. Verify that this is the intended server.
Category	`TOPOLOGY`
GQLSTATUS code	`00N80`
Status description	note: successful completion - server already enabled. `ENABLE SERVER` has no effect. Server `{ $server }` is already enabled. Verify that this is the intended server.
Classification	`TOPOLOGY`
SeverityLevel	`INFORMATION`

Example 45. Enabling an already enabled server

Command

ENABLE SERVER "123e4567-e89b-12d3-a456-426614174000"

Description of the returned code

Server 123e4567-e89b-12d3-a456-426614174000 is already enabled. Verify that this is the intended server.

Command

ENABLE SERVER "123e4567-e89b-12d3-a456-426614174000"

Returned GQLSTATUS code

00N80

Returned status description

note: successful completion - server already enabled. ENABLE SERVER has no effect. Server 123e4567-e89b-12d3-a456-426614174000 is already enabled. Verify that this is the intended server.

Server already cordoned

Table 28. Notification details
Neo4j code	`Neo.ClientNotification.Cluster.ServerAlreadyCordoned`
Title	`<command>` has no effect.
Description	Server `%s` is already cordoned. Verify that this is the intended server.
Category	`TOPOLOGY`
GQLSTATUS code	`00N81`
Status description	note: successful completion - server already cordoned. `CORDON SERVER` has no effect. Server `{ $server }` is already cordoned. Verify that this is the intended server.
Classification	`TOPOLOGY`
SeverityLevel	`INFORMATION`

Example 46. Cordoning an already cordoned server

Command

CORDON SERVER "123e4567-e89b-12d3-a456-426614174000"

Description of the returned code

Server 123e4567-e89b-12d3-a456-426614174000 is already cordoned. Verify that this is the intended server.

Command

CORDON SERVER "123e4567-e89b-12d3-a456-426614174000"

Returned GQLSTATUS code

00N81

Returned status description

note: successful completion - server already cordoned. CORDON SERVER has no effect. Server 123e4567-e89b-12d3-a456-426614174000 is already cordoned. Verify that this is the intended server.

No databases reallocated

Table 29. Notification details
Neo4j code	`Neo.ClientNotification.Cluster.NoDatabasesReallocated`
Title	`<command>` has no effect.
Description	No databases were reallocated. No better allocation is currently possible.
Category	`TOPOLOGY`
GQLSTATUS code	`00N82`
Status description	note: successful completion - no databases reallocated. `REALLOCATE DATABASES` has no effect. No databases were reallocated. No better allocation is currently possible.
Classification	`TOPOLOGY`
SeverityLevel	`INFORMATION`

Example 47. Reallocating databases resulted in no allocation changes

Command

REALLOCATE DATABASES

Description of the returned code

No databases were reallocated. No better allocation is currently possible.

Example scenarios

Scenario 1: The cluster is already balanced. For example, when there are three servers, each hosting databases foo and bar, meaning all databases are allocated to all servers.

Scenario 2: The cluster appears unbalanced, but server constraints prevent you from moving to a better, more balanced, allocation. For example, assuming server 1 hosts databases foo and bar, server 2 hosts only foo, and server 3 hosts no databases. Then, a better allocation would move foo from server 1 to server 3, but if server 3 has the constraint deniedDatabases:['foo']}, then the cluster is already balanced subject to this constraint.

Command

REALLOCATE DATABASES

Returned GQLSTATUS code

00N82

Returned status description

note: successful completion - no databases reallocated. REALLOCATE DATABASES has no effect. No databases were reallocated. No better allocation is currently possible.

Example scenarios

Scenario 1: The cluster is already balanced. For example, when there are three servers, each hosting databases foo and bar, meaning all databases are allocated to all servers.

Cordoned servers existed during allocation

This notification is returned when a Cypher administration command triggers an allocation decision and some of the servers are cordoned. For example, CREATE DATABASE, ALTER DATABASE, DEALLOCATE DATABASES FROM SERVER[S], and ALTER DATABASE return this notification. However, REALLOCATE DATABASES requires that there are no cordoned servers and, therefore, does not return it.

Table 30. Notification details
Neo4j code	`Neo.ClientNotification.Cluster.CordonedServersExistedDuringAllocation`
Title	Cordoned servers existed when making an allocation decision.
Description	Server(s) `%s` are cordoned. This can impact allocation decisions.
Category	`TOPOLOGY`
GQLSTATUS code	`00N83`
Status description	note: successful completion - cordoned servers existed during allocation. Cordoned servers existed when making an allocation decision. Server(s) `{ $server_list }` are cordoned. This can impact allocation decisions.
Classification	`TOPOLOGY`
SeverityLevel	`INFORMATION`

Example 48. Cordoned servers existed during an allocation decision

The example assumes that you have a cluster with three servers, of which server 123e4567-e89b-12d3-a456-426614174000 is cordoned using the dbms.cluster.cordonServer procedure. Then the below command will return this notification.

Command

CREATE DATABASE foo TOPOLOGY 2 PRIMARIES

Description of the returned code

Server(s) 123e4567-e89b-12d3-a456-426614174000 are cordoned. This can impact allocation decisions.

Command

CREATE DATABASE foo TOPOLOGY 2 PRIMARIES

Returned GQLSTATUS code

00N83

Returned status description

note: successful completion - cordoned servers existed during allocation. Cordoned servers existed when making an allocation decision. Server(s) 123e4567-e89b-12d3-a456-426614174000 are cordoned. This can impact allocation decisions.

Requested topology matched current topology

Table 31. Notification details
Neo4j code	`Neo.ClientNotification.Cluster.RequestedTopologyMatchedCurrentTopology`
Title	`<command>` has no effect.
Description	The requested topology matched the current topology. No allocations were changed.
Category	`TOPOLOGY`
GQLSTATUS code	`00N84`
Status description	note: successful completion - requested topology matched current topology. `ALTER DATABASE` has no effect. The requested topology matched the current topology. No allocations were changed.
Classification	`TOPOLOGY`
SeverityLevel	`INFORMATION`

Example 49. Requested topology matched current topology

The example assumes that you have a cluster with three servers and a database foo with a topology of two primaries and one secondary.

Command

ALTER DATABASE foo SET TOPOLOGY 2 PRIMARIES 1 SECONDARY

Description of the returned code

The requested topology matched the current topology. No allocations were changed.

The example assumes that you have a cluster with three servers and a database foo with a topology of two primaries and one secondary.

Command

ALTER DATABASE foo SET TOPOLOGY 2 PRIMARIES 1 SECONDARY

Returned GQLSTATUS code

00N84

Returned status description

note: successful completion - requested topology matched current topology. ALTER DATABASE has no effect. The requested topology matched the current topology. No allocations were changed.

`SCHEMA` category

Schema notifications provide additional information related to indexes and constraints.

Index or constraint already exists

Table 32. Notification details
Neo4j code	`Neo.ClientNotification.Schema.IndexOrConstraintAlreadyExists`
Title	`<command>` has no effect.
Description	`<conflicting>` already exists.
Description	`%s` already exists.
Category	`SCHEMA`
GQLSTATUS code	`00NA0`
Status description	note: successful completion - index or constraint already exists. `{ $cmd }` has no effect. `{ $index_constr_pat }` already exists.
SeverityLevel	`INFORMATION`

*<command> and cmd could be either the full command given by the user or a subset of the given command.

Example 50. Creating an index when an equivalent index already exists

Given a range index on (:Label {property}) named existingRangeIndex.

Command

CREATE INDEX labelProperyRangeIndex IF NOT EXISTS FOR (n:Label) ON (n.property)

Title of the returned code

CREATE RANGE INDEX labelProperyRangeIndex IF NOT EXISTS FOR (e:Label) ON (e.property) has no effect.

Full description of the returned code

RANGE INDEX existingRangeIndex FOR (e:Label) ON (e.property) already exists.

Given a range index on (:Label {property}) named existingRangeIndex.

Command

CREATE INDEX labelProperyRangeIndex IF NOT EXISTS FOR (n:Label) ON (n.property)

Returned GQLSTATUS code

00NA0

Returned status description

note: successful completion - index or constraint already exists. CREATE RANGE INDEX labelProperyRangeIndex IF NOT EXISTS FOR (e:Label) ON (e.property) has no effect. RANGE INDEX existingRangeIndex FOR (e:Label) ON (e.property) already exists.

Example 51. Creating an index when another unrelated index using that name already exists

Given a range index on (:Label {property}) named myIndex.

Command

CREATE TEXT INDEX myIndex IF NOT EXISTS FOR ()-[r:REL_TYPE]-() ON (r.property)

Title of the returned code

CREATE TEXT INDEX myIndex IF NOT EXISTS FOR ()-[e:REL_TYPE]-() ON (e.property) has no effect.

Full description of the returned code

RANGE INDEX myIndex FOR (e:Label) ON (e.property) already exists.

Suggestions for improvement

Choose a different name for the new index and try again.

CREATE TEXT INDEX myIndex2 IF NOT EXISTS FOR ()-[r:REL_TYPE]-() ON (r.property)

Given a range index on (:Label {property}) named myIndex.

Command

CREATE TEXT INDEX myIndex IF NOT EXISTS FOR ()-[r:REL_TYPE]-() ON (r.property)

Returned GQLSTATUS code

00NA0

Returned status description

note: successful completion - index or constraint already exists. CREATE TEXT INDEX myIndex IF NOT EXISTS FOR ()-[e:REL_TYPE]-() ON (e.property) has no effect. RANGE INDEX myIndex FOR (e:Label) ON (e.property) already exists.

Suggestions for improvement

Choose a different name for the new index and try again.

CREATE TEXT INDEX myIndex2 IF NOT EXISTS FOR ()-[r:REL_TYPE]-() ON (r.property)

Example 52. Creating a constraint when an identical constraint already exists

Given a node key constraint on (:Label {property}) named nodeKeyLabelPropertyConstraint.

Command

CREATE CONSTRAINT nodeKeyLabelPropertyConstraint IF NOT EXISTS FOR (n:Label) REQUIRE (n.property) IS NODE KEY

Title of the returned code

CREATE CONSTRAINT nodeKeyLabelPropertyConstraint IF NOT EXISTS FOR (e:Label) REQUIRE (e.property) IS NODE KEY has no effect.

Full description of the returned code

CONSTRAINT nodeKeyLabelPropertyConstraint FOR (e:Label) REQUIRE (e.property) IS NODE KEY already exists.

Given a node key constraint on (:Label {property}) named nodeKeyLabelPropertyConstraint.

Command

CREATE CONSTRAINT nodeKeyLabelPropertyConstraint IF NOT EXISTS FOR (n:Label) REQUIRE (n.property) IS NODE KEY

Returned GQLSTATUS code

00NA0

Returned status description

note: successful completion - index or constraint already exists. CREATE CONSTRAINT nodeKeyLabelPropertyConstraint IF NOT EXISTS FOR (e:Label) REQUIRE (e.property) IS NODE KEY has no effect. CONSTRAINT nodeKeyLabelPropertyConstraint FOR (e:Label) REQUIRE (e.property) IS NODE KEY already exists.

Example 53. Creating a constraint when another unrelated constraint using that name already exists

Given a node key constraint on (:Label {property}) named myConstraint.

Command

CREATE CONSTRAINT myConstraint IF NOT EXISTS FOR (n:Label2) REQUIRE (n.property2) IS NOT NULL

Title of the returned code

CREATE CONSTRAINT myConstraint IF NOT EXISTS FOR (e:Label2) REQUIRE (e.property2) IS NOT NULL has no effect.

Full description of the returned code

CONSTRAINT myConstraint FOR (e:Label) REQUIRE (e.property) IS NODE KEY already exists.

Suggestions for improvement

Choose a different name for the new constraint and try again.

CREATE CONSTRAINT myConstraint2 IF NOT EXISTS FOR (n:Label2) REQUIRE (n.property2) IS NOT NULL

Given a node key constraint on (:Label {property}) named myConstraint.

Command

CREATE CONSTRAINT myConstraint IF NOT EXISTS FOR (n:Label2) REQUIRE (n.property2) IS NOT NULL

Returned GQLSTATUS code

00NA0

Returned status description

note: successful completion - index or constraint already exists. CREATE CONSTRAINT myConstraint IF NOT EXISTS FOR (e:Label2) REQUIRE (e.property2) IS NOT NULL has no effect. CONSTRAINT myConstraint FOR (e:Label) REQUIRE (e.property) IS NODE KEY already exists.

Suggestions for improvement

Choose a different name for the new constraint and try again.

CREATE CONSTRAINT myConstraint2 IF NOT EXISTS FOR (n:Label2) REQUIRE (n.property2) IS NOT NULL

Index or constraint does not exist

Table 33. Notification details
Neo4j code	`Neo.ClientNotification.Schema.IndexOrConstraintDoesNotExist`
Title	`<command>` has no effect.
Description	`%s` does not exist.
Category	`SCHEMA`
GQLSTATUS code	`00NA1`
Status description	note: successful completion - index or constraint does not exist. `{ $cmd }` has no effect. `{ $index_constr_name }` does not exist.
SeverityLevel	`INFORMATION`

Example 54. Attempting to drop a non-existing index

Command

DROP INDEX nonExistingIndex IF EXISTS

Title of the returned code

DROP INDEX nonExistingIndex IF EXISTS has no effect.

Full description of the returned code

nonExistingIndex does not exist.

Suggestions for improvement

Verify that this is the intended index and that it is spelled correctly.

Command

DROP INDEX nonExistingIndex IF EXISTS

Returned GQLSTATUS code

00NA1

Returned status description

note: successful completion - index or constraint does not exist. DROP INDEX nonExistingIndex IF EXISTS has no effect. nonExistingIndex does not exist.

Suggestions for improvement

Verify that this is the intended index and that it is spelled correctly.

Example 55. Attempting to drop a non-existing constraint

Command

DROP CONSTRAINT nonExistingConstraint IF EXISTS

Title of the returned code

DROP CONSTRAINT nonExistingConstraint IF EXISTS has no effect.

Full description of the returned code

nonExistingConstraint does not exist.

Suggestions for improvement

Verify that this is the intended constraint and that it is spelled correctly.

Command

DROP CONSTRAINT nonExistingConstraint IF EXISTS

Returned GQLSTATUS code

00NA1

Returned status description

note: successful completion - index or constraint does not exist. DROP CONSTRAINT nonExistingConstraint IF EXISTS has no effect. nonExistingConstraint does not exist.

Suggestions for improvement

Verify that this is the intended constraint and that it is spelled correctly.

`GENERIC` notifications

GENERIC notification codes do not belong to any wider category and do not have any connection to each other.

Subquery variable shadowing

Table 34. Notification details
Neo4j code	`Neo.ClientNotification.Statement.SubqueryVariableShadowing`
Title	Variable in subquery is shadowing a variable with the same name from the outer scope.
Description	Variable in subquery is shadowing a variable with the same name from the outer scope. If you want to use that variable instead, it must be imported into the subquery using importing WITH clause. (`%s`)
Category	`GENERIC`
GQLSTATUS code	`03N60`
Status description	info: subquery variable shadowing. The variable `{ $var }` in the subquery uses the same name as a variable from the outer query. Use `WITH $var` in the subquery to import the one from the outer scope unless you want it to be a new variable.
Classification	`GENERIC`
SeverityLevel	`INFORMATION`

Example 56. Shadowing of a variable from the outer scope

Query

MATCH (n)
CALL {
  MATCH (n)--(m)
  RETURN m
}
RETURN *

Description of the returned code

Variable in subquery is shadowing a variable with the same name from the outer scope. If you want to use that variable instead, it must be imported into the subquery using importing WITH clause. (the shadowing variable is: n)

Suggestions for improvement

If the intended behavior of the query is for the variable in the subquery to be a new variable, then nothing needs to be done. If the intended behavior is to use the variable from the outer query, it needs to be imported to the subquery using the WITH clause.

MATCH (n)
CALL {
  WITH n
  MATCH (n)--(m)
  RETURN m
}
RETURN *

Query

MATCH (n)
CALL {
  MATCH (n)--(m)
  RETURN m
}
RETURN *

Returned GQLSTATUS code

03N60

Returned status description

info: subquery variable shadowing. The variable n in the subquery uses the same name as a variable from the outer query. Use WITH n in the subquery to import the one from the outer scope unless you want it to be a new variable.

Suggestions for improvement

MATCH (n)
CALL {
  WITH n
  MATCH (n)--(m)
  RETURN m
}
RETURN *

Redundant optional procedure

Table 35. Notification details
Neo4j code	`Neo.ClientNotification.Statement.RedundantOptionalProcedure`
Title	The use of `OPTIONAL` is redundant when the procedure calls a void procedure.
Description	The use of `OPTIONAL` is redundant as `CALL %s` is a void procedure.
Category	`GENERIC`
GQLSTATUS code	`03N61`
Status description	info: redundant optional procedure. The use of `OPTIONAL` is redundant as `CALL %s` is a void procedure.
Classification	`GENERIC`
SeverityLevel	`INFORMATION`

Example 57. Redundant use of OPTIONAL in a procedure call

Query

OPTIONAL CALL db.createLabel("A")

Description of the returned code

The use of OPTIONAL is redundant as CALL db.createLabel is a void procedure.

Suggestions for improvement

If the intended behavior of the query is to use a void procedure, the OPTIONAL keyword can be removed without impacting the query.

CALL db.createLabel("A")

Query

OPTIONAL CALL db.createLabel("A")

Returned GQLSTATUS code

03N61

Returned status description

info: redundant optional procedure. The use of OPTIONAL is redundant as CALL db.createLabel is a void procedure.

Suggestions for improvement

If the intended behavior of the query is to use a void procedure, the OPTIONAL keyword can be removed without impacting the query.

CALL db.createLabel("A")

Redundant optional subquery

Table 36. Notification details
Neo4j code	`Neo.ClientNotification.Statement.RedundantOptionalSubquery`
Title	The use of `OPTIONAL` is redundant when `CALL` is a unit subquery.
Description	The use of `OPTIONAL` is redundant as `CALL` is a unit subquery.
Category	`GENERIC`
GQLSTATUS code	`03N62`
Status description	info: redundant optional subquery. The use of `OPTIONAL` is redundant as `CALL` is a unit subquery.
Classification	`GENERIC`
SeverityLevel	`INFORMATION`

Example 58. Redundant use of OPTIONAL in a CALL subquery

Query

UNWIND [1, 2, 3] AS x
OPTIONAL CALL (x) {
   CREATE({i:x})
}

Description of the returned code

Optional is redundant in the case of a unit subquery. The use of OPTIONAL on unit subqueries have no effect and can be removed.

Suggestions for improvement

If the intended behavior of the query is for the subquery not to return any values, the OPTIONAL keyword can be removed without impacting the query.

UNWIND [1, 2, 3] AS x
CALL (x) {
   CREATE({i:x})
}

Query

UNWIND [1, 2, 3] AS x
OPTIONAL CALL (x) {
   CREATE({i:x})
}

Returned GQLSTATUS code

03N62

Description of the returned code

info: redundant optional subquery. The use of OPTIONAL is redundant as CALL is a unit subquery.

Suggestions for improvement

If the intended behavior of the query is for the subquery not to return any values, the OPTIONAL keyword can be removed without impacting the query.

UNWIND [1, 2, 3] AS x
CALL (x) {
   CREATE({i:x})
}

Parameter missing

Table 37. Notification details
Neo4j code	`Neo.ClientNotification.Statement.ParameterNotProvided`
Title	The statement refers to a parameter that was not provided in the request.
Description	Did not supply query with enough parameters. The produced query plan will not be cached and is not executable without EXPLAIN. (`%s`)
Category	`GENERIC`
GQLSTATUS code	`01N60`
Status description	warn: parameter missing. The query plan cannot be cached and is not executable without `EXPLAIN` due to the undefined parameter(s) `{ $param_list }`. Provide the parameter(s).
Classification	`GENERIC`
SeverityLevel	`WARNING`

Example 59. Using an EXPLAIN query with parameters without providing them

Query

EXPLAIN WITH $param as param
RETURN param

Description of the returned code

Did not supply query with enough parameters. The produced query plan will not be cached and is not executable without EXPLAIN. (Missing parameters: param)

Suggestions for improvement

Provide the parameter to be able to cache the plan.

Query

EXPLAIN WITH $param as param
RETURN param

Returned GQLSTATUS code

01N60

Returned status description

warn: parameter missing. The query plan cannot be cached and is not executable without EXPLAIN due to the undefined parameter(s) { $param }. Provide the parameter(s).

Suggestions for improvement

Provide the parameter to be able to cache the plan.

Procedure or function execution warning

Table 38. Notification details
Neo4j code	`Neo.ClientNotification.Procedure.ProcedureWarning`
Title	The query used a procedure that generated a warning.
Description	The query used a procedure that generated a warning. (`%s`)
Category	`GENERIC`
GQLSTATUS code	`01N62`
Status description	warn: procedure execution warning. The procedure `{ $proc }` generates the warning `{ $msg }`.
Classification	`GENERIC`
SeverityLevel	`WARNING`

Unsatisfiable relationship type expression

When matching on a relationship type expression that can never be satisfied, for example asking for zero, more than one or contradictory types.

Table 39. Notification category details
Neo4j code	`Neo.ClientNotification.Statement.UnsatisfiableRelationshipTypeExpression`
Title	The query contains a relationship type expression that cannot be satisfied.
Description	Relationship type expression cannot possibly be satisfied. (`%s`)
Category	`GENERIC`
GQLSTATUS code	`01N61`
Status description	warn: unsatisfiable relationship type expression. The expression `{ $label_expr }` cannot be satisfied because relationships must have exactly one type.
Classification	`GENERIC`
SeverityLevel	`WARNING`

Example 60. Matching on a relationship type expression that can never be satisfied

Query

MATCH ()-[r:R1&R2]->() RETURN r

Description of the returned code

Relationship type expression cannot possibly be satisfied. (R1&R2 can never be fulfilled by any relationship. Relationships must have exactly one type.)

Query

MATCH ()-[r:R1&R2]->() RETURN r

Returned GQLSTATUS code

01N61

Returned status description

warn: unsatisfiable relationship type expression. The expression R1&R2 cannot be satisfied because relationships must have exactly one type.

Repeated relationship reference

Table 40. Notification category details
Neo4j code	`Neo.ClientNotification.Statement.RepeatedRelationshipReference`
Title	The query returns no results because a relationship variable is bound more than once.
Description	A relationship is referenced more than once in the query, which leads to no results because relationships must not occur more than once in each result. (`%s`) A variable-length relationship variable is bound more than once, which leads to no results because relationships must not occur more than once in each result. (`%s`)
Category	`GENERIC`
GQLSTATUS code	`01N63`
Status description	warn: repeated relationship reference. `{ $var }` is repeated in `{ $pat }`, which leads to no results.
Classification	`GENERIC`
SeverityLevel	`WARNING`

Example 61. Binding a relationship variable more than once

Query

MATCH (:A)-[r]->(), ()-[r]->(:B) RETURN r

Description of the returned code

A relationship is referenced more than once in the query, which leads to no results because relationships must not occur more than once in each result. (Relationship r was repeated)

Suggestions for improvement

Use one pattern to match all relationships that start with a node with the label A and end with a node with the label B:

MATCH (:A)-[r]->(:B) RETURN r

Query

MATCH (:A)-[r]->(), ()-[r]->(:B) RETURN r

Returned GQLSTATUS code

01N63

Returned status description

warn: repeated relationship reference. r is repeated in (:A)-[r]→(), ()-[r]→(:B), which leads to no results.

Suggestions for improvement

Use one pattern to match all relationships that start with a node with the label A and end with a node with the label B:

MATCH (:A)-[r]->(:B) RETURN r

Example 62. Binding a variable-length relationship variable more than once (when run on version 5.6 or newer)

Query

MATCH ()-[r*]->()<-[r*]-() RETURN count(*) AS count

Description of the returned code

A variable-length relationship variable is bound more than once, which leads to no results because relationships must not occur more than once in each result. (Relationship r was repeated)

Query

MATCH ()-[r*]->()<-[r*]-() RETURN count(*) AS count

Returned GQLSTATUS code

01N63

Returned status description

warn: repeated relationship reference. r is repeated in ()-[r*]→()←[r*]-(), which leads to no results.

List of all server notification codes

PERFORMANCE notifications

Cartesian product

Unbounded variable length pattern

Exhaustive shortest path

No applicable index

Eager operator

Dynamic property

Failed code generation

HINT notifications

Join hint unfulfillable

Hinted index not found

UNRECOGNIZED notifications

Home database not found

Unknown label

Unknown relationship type

Unknown property key

Aggregation skipped null

UNSUPPORTED category

Unsupported runtime

RuntimeExperimental

DEPRECATION notifications

Feature deprecated

Feature deprecated with a replacement

Deprecated features without a future replacement

Procedure field deprecated

Feature deprecated with replacement - DeprecatedFormat

SECURITY category

Role or privilege not assigned

Role or privilege already assigned

Impossible revoke command

AuthProviderNotDefined

ExternalAuthNotEnabled

TOPOLOGY category

Server already enabled

Server already cordoned

No databases reallocated

Cordoned servers existed during allocation

Requested topology matched current topology

SCHEMA category

Index or constraint already exists

Index or constraint does not exist

GENERIC notifications

Subquery variable shadowing

Redundant optional procedure

Redundant optional subquery

Parameter missing

Procedure or function execution warning

Unsatisfiable relationship type expression

Repeated relationship reference

`PERFORMANCE` notifications

`HINT` notifications

`UNRECOGNIZED` notifications

`UNSUPPORTED` category

`DEPRECATION` notifications

`SECURITY` category

`TOPOLOGY` category

`SCHEMA` category

`GENERIC` notifications