2002-03-01 23:45:19 +01:00
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doc/src/sgml/ref/alter_database.sgml
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2002-03-01 23:45:19 +01:00
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PostgreSQL documentation
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-->
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<refentry id="SQL-ALTERDATABASE">
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2014-02-24 03:25:35 +01:00
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<indexterm zone="sql-alterdatabase">
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<primary>ALTER DATABASE</primary>
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</indexterm>
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<refmeta>
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2010-04-03 09:23:02 +02:00
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<refentrytitle>ALTER DATABASE</refentrytitle>
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2008-11-14 11:22:48 +01:00
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<manvolnum>7</manvolnum>
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<refmiscinfo>SQL - Language Statements</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>ALTER DATABASE</refname>
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<refpurpose>change a database</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<synopsis>
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2005-07-31 19:19:22 +02:00
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ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> [ [ WITH ] <replaceable class="PARAMETER">option</replaceable> [ ... ] ]
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<phrase>where <replaceable class="PARAMETER">option</replaceable> can be:</phrase>
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2014-07-02 02:10:38 +02:00
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ALLOW_CONNECTIONS <replaceable class="PARAMETER">allowconn</replaceable>
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CONNECTION LIMIT <replaceable class="PARAMETER">connlimit</replaceable>
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IS_TEMPLATE <replaceable class="PARAMETER">istemplate</replaceable>
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2009-09-19 12:23:27 +02:00
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ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> RENAME TO <replaceable>new_name</replaceable>
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2004-07-05 04:34:43 +02:00
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Allow CURRENT/SESSION_USER to be used in certain commands
Commands such as ALTER USER, ALTER GROUP, ALTER ROLE, GRANT, and the
various ALTER OBJECT / OWNER TO, as well as ad-hoc clauses related to
roles such as the AUTHORIZATION clause of CREATE SCHEMA, the FOR clause
of CREATE USER MAPPING, and the FOR ROLE clause of ALTER DEFAULT
PRIVILEGES can now take the keywords CURRENT_USER and SESSION_USER as
user specifiers in place of an explicit user name.
This commit also fixes some quite ugly handling of special standards-
mandated syntax in CREATE USER MAPPING, which in particular would fail
to work in presence of a role named "current_user".
The special role specifiers PUBLIC and NONE also have more consistent
handling now.
Also take the opportunity to add location tracking to user specifiers.
Authors: Kyotaro Horiguchi. Heavily reworked by Álvaro Herrera.
Reviewed by: Rushabh Lathia, Adam Brightwell, Marti Raudsepp.
2015-03-09 19:41:54 +01:00
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ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> OWNER TO { <replaceable>new_owner</replaceable> | CURRENT_USER | SESSION_USER }
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2008-11-07 19:25:07 +01:00
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ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> SET TABLESPACE <replaceable class="PARAMETER">new_tablespace</replaceable>
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ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> SET <replaceable>configuration_parameter</replaceable> { TO | = } { <replaceable>value</replaceable> | DEFAULT }
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ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> SET <replaceable>configuration_parameter</replaceable> FROM CURRENT
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ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> RESET <replaceable>configuration_parameter</replaceable>
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ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> RESET ALL
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</synopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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<command>ALTER DATABASE</command> changes the attributes
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of a database.
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</para>
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<para>
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The first form changes certain per-database settings. (See below for
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details.) Only the database owner or a superuser can change these settings.
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</para>
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<para>
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The second form changes the name of the database. Only the database
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owner or a superuser can rename a database; non-superuser owners must
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also have the
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<literal>CREATEDB</literal> privilege. The current database cannot
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be renamed. (Connect to a different database if you need to do
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that.)
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</para>
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<para>
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The third form changes the owner of the database.
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To alter the owner, you must own the database and also be a direct or
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indirect member of the new owning role, and you must have the
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<literal>CREATEDB</literal> privilege.
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(Note that superusers have all these privileges automatically.)
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</para>
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<para>
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The fourth form changes the default tablespace of the database.
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Only the database owner or a superuser can do this; you must also have
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create privilege for the new tablespace.
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This command physically moves any tables or indexes in the database's old
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default tablespace to the new tablespace. The new default tablespace
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must be empty for this database, and no one can be connected to
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the database. Tables and indexes in non-default tablespaces are
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unaffected.
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</para>
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2007-09-03 20:46:30 +02:00
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<para>
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The remaining forms change the session default for a run-time
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configuration variable for a <productname>PostgreSQL</productname>
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database. Whenever a new session is subsequently started in that
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database, the specified value becomes the session default value.
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The database-specific default overrides whatever setting is present
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in <filename>postgresql.conf</> or has been received from the
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<command>postgres</command> command line. Only the database
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owner or a superuser can change the session defaults for a
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database. Certain variables cannot be set this way, or can only be
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set by a superuser.
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</para>
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</refsect1>
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2003-04-15 15:25:08 +02:00
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<refsect1>
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<title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><replaceable class="PARAMETER">name</replaceable></term>
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<listitem>
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<para>
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The name of the database whose attributes are to be altered.
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</para>
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</listitem>
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</varlistentry>
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2014-07-02 02:10:38 +02:00
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<varlistentry>
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<term><replaceable class="parameter">allowconn</replaceable></term>
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<listitem>
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<para>
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If false then no one can connect to this database.
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</para>
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</listitem>
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</varlistentry>
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2014-07-02 02:10:38 +02:00
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<varlistentry>
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<term><replaceable class="parameter">connlimit</replaceable></term>
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<listitem>
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<para>
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How many concurrent connections can be made
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to this database. -1 means no limit.
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</para>
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</listitem>
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</varlistentry>
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2015-09-18 02:56:58 +02:00
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<varlistentry>
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<term><replaceable class="parameter">istemplate</replaceable></term>
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<listitem>
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<para>
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If true, then this database can be cloned by any user with <literal>CREATEDB</literal>
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privileges; if false, then only superusers or the owner of the
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database can clone it.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>new_name</replaceable></term>
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<listitem>
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<para>
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The new name of the database.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">new_owner</replaceable></term>
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<listitem>
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<para>
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The new owner of the database.
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</para>
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</listitem>
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</varlistentry>
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2008-11-07 19:25:07 +01:00
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<varlistentry>
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<term><replaceable class="parameter">new_tablespace</replaceable></term>
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<listitem>
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<para>
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The new default tablespace of the database.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>configuration_parameter</replaceable></term>
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<term><replaceable>value</replaceable></term>
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<listitem>
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<para>
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Set this database's session default for the specified configuration
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parameter to the given value. If
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<replaceable>value</replaceable> is <literal>DEFAULT</literal>
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or, equivalently, <literal>RESET</literal> is used, the
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database-specific setting is removed, so the system-wide default
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setting will be inherited in new sessions. Use <literal>RESET
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ALL</literal> to clear all database-specific settings.
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<literal>SET FROM CURRENT</> saves the session's current value of
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the parameter as the database-specific value.
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</para>
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<para>
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See <xref linkend="sql-set"> and <xref linkend="runtime-config">
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for more information about allowed parameter names
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and values.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>
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It is also possible to tie a session default to a specific role
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rather than to a database; see
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<xref linkend="sql-alterrole">.
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Role-specific settings override database-specific
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ones if there is a conflict.
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</para>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<para>
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To disable index scans by default in the database
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<literal>test</literal>:
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<programlisting>
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ALTER DATABASE test SET enable_indexscan TO off;
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</programlisting></para>
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</refsect1>
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<refsect1>
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<title>Compatibility</title>
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<para>
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The <command>ALTER DATABASE</command> statement is a
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<productname>PostgreSQL</productname> extension.
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</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<simplelist type="inline">
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<member><xref linkend="sql-createdatabase"></member>
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<member><xref linkend="sql-dropdatabase"></member>
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<member><xref linkend="sql-set"></member>
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<member><xref linkend="sql-createtablespace"></member>
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</simplelist>
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</refsect1>
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</refentry>
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