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<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/alter_database.sgml,v 1.11 2003/11/29 19:51:38 pgsql Exp $
PostgreSQL documentation
-->
<refentry id="SQL-ALTERDATABASE">
<refmeta>
<refentrytitle id="sql-alterdatabase-title">ALTER DATABASE</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>ALTER DATABASE</refname>
<refpurpose>change a database</refpurpose>
</refnamediv>
<indexterm zone="sql-alterdatabase">
<primary>ALTER DATABASE</primary>
</indexterm>
<refsynopsisdiv>
<synopsis>
ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> SET <replaceable>parameter</replaceable> { TO | = } { <replaceable>value</replaceable> | DEFAULT }
ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> RESET <replaceable>parameter</replaceable>
ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> RENAME TO <replaceable>newname</replaceable>
</synopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<command>ALTER DATABASE</command> is used to change the attributes
of a database.
</para>
<para>
The first two forms change the session default of a run-time
configuration variable for a <productname>PostgreSQL</productname>
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 <filename>postgresql.conf</> or has been received from the
<command>postmaster</command> command line. Only the database
owner or a superuser can change the session defaults for a
database.
</para>
<para>
The third form changes the name of the database. Only the database
owner can rename a database, and only if he has the
<literal>CREATEDB</literal> privilege. The current database cannot
be renamed. (Connect to a different database if you need to do
that.)
</para>
</refsect1>
<refsect1>
<title>Parameters</title>
<variablelist>
<varlistentry>
<term><replaceable class="PARAMETER">name</replaceable></term>
<listitem>
<para>
The name of the database whose session defaults are to be altered.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable>parameter</replaceable></term>
<term><replaceable>value</replaceable></term>
<listitem>
<para>
Set the session default for this database of the specified
configuration parameter to the given value. If
<replaceable>value</replaceable> is <literal>DEFAULT</literal>
or, equivalently, <literal>RESET</literal> is used, the
database-specific variable setting is removed and the system-wide
default
setting will be inherited in new sessions. Use <literal>RESET
ALL</literal> to clear all settings.
</para>
<para>
See <xref linkend="sql-set" endterm="sql-set-title"> and <xref linkend="runtime-config">
for more information about allowed parameter names
and values.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable>newname</replaceable></term>
<listitem>
<para>
The new name of the database.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Notes</title>
<para>
Using <xref linkend="sql-alteruser" endterm="sql-alteruser-title">,
it is also possible to tie a session default to a specific user
rather than a database. User-specific settings override database-specific
ones if there is a conflict.
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
To disable index scans by default in the database
<literal>test</literal>:
<programlisting>
ALTER DATABASE test SET enable_indexscan TO off;
</programlisting>
</para>
</refsect1>
<refsect1>
<title>Compatibility</title>
<para>
The <command>ALTER DATABASE</command> statement is a
<productname>PostgreSQL</productname> extension.
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<simplelist type="inline">
<member><xref linkend="sql-alteruser" endterm="sql-alteruser-title"></member>
<member><xref linkend="sql-createdatabase" endterm="sql-createdatabase-title"></member>
<member><xref linkend="sql-dropdatabase" endterm="sql-dropdatabase-title"></member>
<member><xref linkend="sql-set" endterm="sql-set-title"></member>
</simplelist>
</refsect1>
</refentry>
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