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_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) and Chapter 19 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)). 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)), DROP DATABASE (DROP_DATABASE(7)), SET(7), CREATE
       TABLESPACE (CREATE_TABLESPACE(7))