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GUC support. It's now possible to set datestyle, timezone, and client_encoding from postgresql.conf and per-database or per-user settings. Also, implement rollback of SET commands that occur in a transaction that later fails. Create a SET LOCAL var = value syntax that sets the variable only for the duration of the current transaction. All per previous discussions in pghackers.
172 lines
4.7 KiB
Plaintext
172 lines
4.7 KiB
Plaintext
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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 $
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PostgreSQL documentation
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-->
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<refentry id="SQL-ALTERDATABASE">
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<refmeta>
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<refentrytitle id="sql-alterdatabase-title">ALTER DATABASE</refentrytitle>
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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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ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> SET <replaceable>variable</replaceable> { TO | = } { <replaceable>value</replaceable> | DEFAULT }
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ALTER DATABASE <replaceable class="PARAMETER">name</replaceable> RESET <replaceable>variable</replaceable>
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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> is used to change the session
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default of a run-time configuration variable for a
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<productname>PostgreSQL</productname> database. Whenever a new
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session is subsequently started in that database, the specified
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value becomes the session default value.
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The database-specific default
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overrides whatever setting is present in <filename>postgresql.conf</>
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or has been received from the postmaster.
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</para>
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<para>
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Only a superuser or the database owner can change the session defaults for a
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database.
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</para>
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<refsect2>
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<title>Parameters</title>
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<para>
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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 session defaults are to be altered.
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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>variable</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 the session default for this database of the specified
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configuration variable 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 variable setting is removed and the system-wide
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default
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setting will be inherited in new sessions. Use <literal>RESET
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ALL</literal> to clear all settings.
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</para>
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<para>
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See <xref linkend="sql-set" endterm="sql-set-title"> and the
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<citetitle>Administrator's Guide</citetitle> for more
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information about allowed variable names 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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</para>
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</refsect2>
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</refsect1>
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<refsect1>
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<title>Diagnostics</title>
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<para>
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<variablelist>
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<varlistentry>
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<term><computeroutput>ALTER DATABASE</computeroutput></term>
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<listitem>
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<para>
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Message returned if the alteration was successful.
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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><computeroutput>ERROR: database "dbname" does not exist</computeroutput></term>
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<listitem>
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<para>
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Error message returned if the specified database is not known
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to the system.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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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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Using <xref linkend="sql-alteruser" endterm="sql-alteruser-title">,
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it is also possible to tie a session default to a specific user
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rather than a database. User-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>
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</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-alteruser" endterm="sql-alteruser-title"></member>
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<member><xref linkend="sql-createdatabase" endterm="sql-createdatabase-title"></member>
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<member><xref linkend="sql-dropdatabase" endterm="sql-dropdatabase-title"></member>
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<member><xref linkend="sql-set" endterm="sql-set-title"></member>
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</simplelist>
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</refsect1>
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</refentry>
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End:
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