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Dots in database name are no longer deprecated. #2452

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Jul 7, 2025
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Dots in database name are no longer deprecated. #2452

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8 changes: 6 additions & 2 deletions ...T/pages/database-administration/aliases/manage-aliases-composite-databases.adoc
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Expand Up @@ -51,7 +51,7 @@ For a description of all the returned columns of this command, and for ways in w

Both local and remote database aliases can be part of a xref::database-administration/composite-databases/concepts.adoc[composite database].

The database alias is made of two parts, separated by a dot: the namespace and the alias name.
The database alias consists of two parts, separated by a dot: the namespace and the alias name.

The namespace must be the name of the composite database.

Expand Down Expand Up @@ -266,9 +266,13 @@ CREATE ALIAS `my.composite.database.with.dots`.`my.other.alias.with.dots` FOR DA
----


[role=label--deprecated]
=== Single dots and local database aliases

[NOTE]
====
As of Neo4j 5.26.9, this feature is no longer deprecated.
====

There is a special case for local database aliases with a single dot without any existing composite database.
If a composite database `some` exists, the query below will create a database alias named `alias` within the composite database `some`.
If no such database exists, however, the same query will instead create a database alias named `some.alias`:
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4 changes: 1 addition & 3 deletions ...les/ROOT/pages/database-administration/standard-databases/naming-databases.adoc
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Expand Up @@ -19,9 +19,7 @@ Naming rules for databases are as follows:
The `-` (dash) and `.` (dot) characters are not legal in Cypher variables.
Names with a `-` in them must be enclosed within backticks.
For example, `CREATE DATABASE ++`main-db`++` is a valid database name.
Database names are the only identifier for which dots do not need to be quoted.
For example `main.db` is a valid database name.
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wouldn't these two make sense to keep? 🤔

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I think this is the sentence which was also removed from the 2025.x docs, so I followed the pattern here.

However, this behavior is deprecated due to the difficulty of determining if a dot is part of the database name or a delimiter for a database alias in a composite database.
Using dots in database names is not recommended, as it makes it difficult to determine if a dot is part of the database name or a delimiter for a database alias in a composite database.
====

It is possible to create an alias to refer to an existing database to avoid these restrictions.
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