2 $PostgreSQL: pgsql/doc/src/sgml/ref/alter_database.sgml,v 1.21 2008/11/07 18:25:06 tgl Exp $
3 PostgreSQL documentation
6 <refentry id="SQL-ALTERDATABASE">
8 <refentrytitle id="sql-alterdatabase-title">ALTER DATABASE</refentrytitle>
9 <refmiscinfo>SQL - Language Statements</refmiscinfo>
13 <refname>ALTER DATABASE</refname>
14 <refpurpose>change a database</refpurpose>
17 <indexterm zone="sql-alterdatabase">
18 <primary>ALTER DATABASE</primary>
23 ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> [ [ WITH ] <replaceable class="PARAMETER">option</replaceable> [ ... ] ]
25 where <replaceable class="PARAMETER">option</replaceable> can be:
27 CONNECTION LIMIT <replaceable class="PARAMETER">connlimit</replaceable>
29 ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> RENAME TO <replaceable>newname</replaceable>
31 ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> OWNER TO <replaceable>new_owner</replaceable>
33 ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> SET TABLESPACE <replaceable class="PARAMETER">new_tablespace</replaceable>
35 ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> SET <replaceable>configuration_parameter</replaceable> { TO | = } { <replaceable>value</replaceable> | DEFAULT }
36 ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> SET <replaceable>configuration_parameter</replaceable> FROM CURRENT
37 ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> RESET <replaceable>configuration_parameter</replaceable>
38 ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> RESET ALL
43 <title>Description</title>
46 <command>ALTER DATABASE</command> changes the attributes
51 The first form changes certain per-database settings. (See below for
52 details.) Only the database owner or a superuser can change these settings.
56 The second form changes the name of the database. Only the database
57 owner or a superuser can rename a database; non-superuser owners must
59 <literal>CREATEDB</literal> privilege. The current database cannot
60 be renamed. (Connect to a different database if you need to do
65 The third form changes the owner of the database.
66 To alter the owner, you must own the database and also be a direct or
67 indirect member of the new owning role, and you must have the
68 <literal>CREATEDB</literal> privilege.
69 (Note that superusers have all these privileges automatically.)
73 The fourth form changes the default tablespace of the database.
74 Only the database owner or a superuser can do this; you must also have
75 create privilege for the new tablespace.
76 This command physically moves any tables or indexes in the database's old
77 default tablespace to the new tablespace. Note that tables and indexes
78 in non-default tablespaces are not affected.
82 The remaining forms change the session default for a run-time
83 configuration variable for a <productname>PostgreSQL</productname>
84 database. Whenever a new session is subsequently started in that
85 database, the specified value becomes the session default value.
86 The database-specific default overrides whatever setting is present
87 in <filename>postgresql.conf</> or has been received from the
88 <command>postgres</command> command line. Only the database
89 owner or a superuser can change the session defaults for a
90 database. Certain variables cannot be set this way, or can only be
96 <title>Parameters</title>
100 <term><replaceable class="PARAMETER">name</replaceable></term>
103 The name of the database whose attributes are to be altered.
109 <term><replaceable class="parameter">connlimit</replaceable></term>
112 How many concurrent connections can be made
113 to this database. -1 means no limit.
119 <term><replaceable>newname</replaceable></term>
122 The new name of the database.
128 <term><replaceable class="parameter">new_owner</replaceable></term>
131 The new owner of the database.
137 <term><replaceable class="parameter">new_tablespace</replaceable></term>
140 The new default tablespace of the database.
146 <term><replaceable>configuration_parameter</replaceable></term>
147 <term><replaceable>value</replaceable></term>
150 Set this database's session default for the specified configuration
151 parameter to the given value. If
152 <replaceable>value</replaceable> is <literal>DEFAULT</literal>
153 or, equivalently, <literal>RESET</literal> is used, the
154 database-specific setting is removed, so the system-wide default
155 setting will be inherited in new sessions. Use <literal>RESET
156 ALL</literal> to clear all database-specific settings.
157 <literal>SET FROM CURRENT</> saves the session's current value of
158 the parameter as the database-specific value.
162 See <xref linkend="sql-set" endterm="sql-set-title"> and <xref linkend="runtime-config">
163 for more information about allowed parameter names
175 It is also possible to tie a session default to a specific role
176 rather than to a database; see
177 <xref linkend="sql-alterrole" endterm="sql-alterrole-title">.
178 Role-specific settings override database-specific
179 ones if there is a conflict.
184 <title>Examples</title>
187 To disable index scans by default in the database
188 <literal>test</literal>:
191 ALTER DATABASE test SET enable_indexscan TO off;
197 <title>Compatibility</title>
200 The <command>ALTER DATABASE</command> statement is a
201 <productname>PostgreSQL</productname> extension.
206 <title>See Also</title>
208 <simplelist type="inline">
209 <member><xref linkend="sql-createdatabase" endterm="sql-createdatabase-title"></member>
210 <member><xref linkend="sql-dropdatabase" endterm="sql-dropdatabase-title"></member>
211 <member><xref linkend="sql-set" endterm="sql-set-title"></member>
212 <member><xref linkend="sql-createtablespace" endterm="sql-createtablespace-title"></member>