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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/alter_database.sgml,v 1.3 2002/05/17 01:19:16 tgl 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>
<refsynopsisdiv>
<synopsis>
ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> SET <replaceable>variable</replaceable> { TO | = } { <replaceable>value</replaceable> | DEFAULT }
ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> RESET <replaceable>variable</replaceable>
</synopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<command>ALTER DATABASE</command> is used to 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 postmaster.
</para>
<para>
Only a superuser or the database owner can change the session defaults for a
database.
</para>
<refsect2>
<title>Parameters</title>
<para>
<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>variable</replaceable></term>
<term><replaceable>value</replaceable></term>
<listitem>
<para>
Set the session default for this database of the specified
configuration variable 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 the
<citetitle>Administrator's Guide</citetitle> for more
information about allowed variable names and values.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
</refsect1>
<refsect1>
<title>Diagnostics</title>
<para>
<variablelist>
<varlistentry>
<term><computeroutput>ALTER DATABASE</computeroutput></term>
<listitem>
<para>
Message returned if the alteration was successful.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><computeroutput>ERROR: database "dbname" does not exist</computeroutput></term>
<listitem>
<para>
Error message returned if the specified database is not known
to the system.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</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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