ALTER DATABASE
Changes the attributes of a database.
Synopsis
ALTER DATABASE <name> [ WITH CONNECTION LIMIT <connlimit> ]
ALTER DATABASE <name> SET <parameter> { TO | = } { <value> | DEFAULT }
ALTER DATABASE <name> RESET <parameter>
ALTER DATABASE <name> RENAME TO <newname>
ALTER DATABASE <name> OWNER TO <new_owner>
Description
ALTER DATABASE
changes the attributes of a database.
The first form changes the allowed connection limit for a database. Only the database owner or a superuser can change this setting.
The second and third forms change the session default for a configuration parameter for a Greenplum 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 the server configuration file (postgresql.conf
). Only the database owner or a superuser can change the session defaults for a database. Certain parameters cannot be set this way, or can only be set by a superuser.
The fourth 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. You cannot rename the current database. Connect to a different database first.
The fifth 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.)
Parameters
name
The name of the database whose attributes are to be altered.
connlimit
The maximum number of concurrent connections possible. The default of -1 means there is no limitation.
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. See Server Configuration Parameters for information about server parameters. for information about all user-settable configuration parameters.
newname
The new name of the database.
new_owner
The new owner of the database.
Notes
It is also possible to set a configuration parameter session default for a specific role (user) rather than to a database. Role-specific settings override database-specific ones if there is a conflict. See ALTER ROLE
.
Examples
To set the default schema search path for the mydatabase
database:
ALTER DATABASE mydatabase SET search_path TO myschema,
public, pg_catalog;
Compatibility
The ALTER DATABASE
statement is a Greenplum Database extension.
See Also
CREATE DATABASE, DROP DATABASE, SET
Parent topic: SQL Command Reference