ALTER DATABASE
Changes a database.
Synopsis
ALTER DATABASE <name> [ WITH CONNECTION LIMIT <connlimit> ]
ALTER DATABASE <name> RENAME TO <new_name>
ALTER DATABASE <name> OWNER TO <new_owner>
ALTER DATABASE <name> SET TABLESPACE <new_tablespace>
ALTER DATABASE <name> SET <configuration_parameter> { TO | = } { <value> | DEFAULT }
ALTER DATABASE <name> SET <configuration_parameter> FROM CURRENT
ALTER DATABASE <name> RESET <configuration_parameter>
ALTER DATABASE <name> RESET ALLDescription
ALTER DATABASE changes the attributes of a database.
The first form changes certain per-database settings (see below for details). Only the database owner or a superuser can change these settings.
The second form changes the name of the database.
Only the database owner or a superuser can rename a database; non-superuser owners must also have the CREATEDB privilege.
The current database cannot be renamed.
Connect to a different database if you need to do that.
The third form changes the owner of the database.
To alter the owner, you must own the database and also be a direct or indirect member of the new owning role, and you must have the CREATEDB privilege.
Note that superusers have all these privileges automatically.
The fourth form changes the default tablespace of the database. Only the database owner or a superuser can do this; you must also have create privilege for the new tablespace. This command physically moves any tables or indexes in the database’s old default tablespace to the new tablespace. Note that tables and indexes in non-default tablespaces are not affected.
The remaining forms change the session default for a runtime configuration variable for a PostgreSQL database.
Whenever a new session is subsequently started in that database, the specified value becomes the session default value.
The database-specific default overrides whatever setting is present in postgresql.conf or has been received from the postgres command line.
Only the database owner or a superuser can change the session defaults for a database.
Certain variables cannot be set this way, or can only be set by a superuser.
Parameters
| Parameter | Description |
|---|---|
name |
The name of the database whose attributes are to be altered |
connlimit |
How many concurrent connections can be made to this database.
|
new_name |
The new name of the database |
new_owner |
The new owner of the database |
new_tablespace |
The new default tablespace of the database |
configuration_parameter |
Set this database’s session default for the specified configuration parameter to the given value.
If |
Notes
It is also possible to tie a session default to a specific role rather than to a database; see ALTER ROLE.
Role-specific settings override database-specific ones if there is a conflict.
Examples
Disable index scans by default in the database test:
ALTER DATABASE test SET enable_indexscan TO off;Compatibility
The ALTER DATABASE statement is a PostgreSQL extension.