# ALTER_DATABASE(7) - man - phpMan

ALTER [DATABASE(7)](https://www.chedong.com/phpMan.php/man/DATABASE/7/markdown)                  PostgreSQL 14.23 Documentation                  ALTER [DATABASE(7)](https://www.chedong.com/phpMan.php/man/DATABASE/7/markdown)



## NAME
       ALTER_DATABASE - change a database

## SYNOPSIS
       ALTER DATABASE _name_ [ [ WITH ] _option_ [ ... ] ]

       where _option_ can be:

           ALLOW_CONNECTIONS _allowconn_
           CONNECTION LIMIT _connlimit_
           IS_TEMPLATE _istemplate_

       ALTER DATABASE _name_ RENAME TO _new_name_

       ALTER DATABASE _name_ OWNER TO { _new_owner_ | CURRENT_ROLE | CURRENT_USER | SESSION_USER }

       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 ALL

## DESCRIPTION
       **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. The new default tablespace must be empty for this database, and no one
       can be connected to the database. Tables and indexes in non-default tablespaces are
       unaffected.

       The remaining forms change the session default for a run-time 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
       _name_
           The name of the database whose attributes are to be altered.

       _allowconn_
           If false then no one can connect to this database.

       _connlimit_
           How many concurrent connections can be made to this database. -1 means no limit.

       _istemplate_
           If true, then this database can be cloned by any user with CREATEDB privileges; if false,
           then only superusers or the owner of the database can clone it.

       _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.

           This form of the command cannot be executed inside a transaction block.

       _configuration_parameter_
       _value_
           Set this database's session default for the specified configuration parameter to the
           given value. If _value_ is DEFAULT or, equivalently, RESET is used, the database-specific
           setting is removed, so the system-wide default setting will be inherited in new sessions.
           Use RESET ALL to clear all database-specific settings.  SET FROM CURRENT saves the
           session's current value of the parameter as the database-specific value.

           See [**SET**(7)](https://www.chedong.com/phpMan.php/man/SET/7/markdown) and Chapter 20 for more information about allowed parameter names and values.

## NOTES
       It is also possible to tie a session default to a specific role rather than to a database;
       see ALTER ROLE (**ALTER**___**[ROLE**(7)](https://www.chedong.com/phpMan.php/man/ROLE/7/markdown)). Role-specific settings override database-specific ones if
       there is a conflict.

## EXAMPLES
       To 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.

## SEE ALSO
       CREATE DATABASE (**CREATE**___**[DATABASE**(7)](https://www.chedong.com/phpMan.php/man/DATABASE/7/markdown)), DROP DATABASE (**DROP**___**[DATABASE**(7)](https://www.chedong.com/phpMan.php/man/DATABASE/7/markdown)), [**SET**(7)](https://www.chedong.com/phpMan.php/man/SET/7/markdown), CREATE
       TABLESPACE (**CREATE**___**[TABLESPACE**(7)](https://www.chedong.com/phpMan.php/man/TABLESPACE/7/markdown))



PostgreSQL 14.23                                2026                               ALTER [DATABASE(7)](https://www.chedong.com/phpMan.php/man/DATABASE/7/markdown)