ALTER DATABASE(7) PostgreSQL 15.7 Documentation ALTER DATABASE(7)
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 REFRESH COLLATION VERSION
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.
REFRESH COLLATION VERSION
Update the database collation version. See Notes for background.
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 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)). 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))
PostgreSQL 15.7 2024 ALTER DATABASE(7)
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