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131 lines
3.4 KiB
Plaintext
131 lines
3.4 KiB
Plaintext
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$PostgreSQL: pgsql/doc/src/sgml/ref/release_savepoint.sgml,v 1.8 2008/11/14 10:22:47 petere Exp $
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PostgreSQL documentation
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-->
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<refentry id="SQL-RELEASE-SAVEPOINT">
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<refmeta>
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<refentrytitle id="SQL-RELEASE-SAVEPOINT-TITLE">RELEASE SAVEPOINT</refentrytitle>
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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>RELEASE SAVEPOINT</refname>
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<refpurpose>destroy a previously defined savepoint</refpurpose>
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</refnamediv>
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<indexterm zone="sql-release-savepoint">
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<primary>RELEASE SAVEPOINT</primary>
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</indexterm>
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<indexterm zone="sql-release-savepoint">
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<primary>savepoints</primary>
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<secondary>releasing</secondary>
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</indexterm>
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<refsynopsisdiv>
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<synopsis>
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RELEASE [ SAVEPOINT ] <replaceable>savepoint_name</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>RELEASE SAVEPOINT</command> destroys a savepoint previously defined
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in the current transaction.
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</para>
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<para>
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Destroying a savepoint makes it unavailable as a rollback point,
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but it has no other user visible behavior. It does not undo the
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effects of commands executed after the savepoint was established.
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(To do that, see <xref linkend="sql-rollback-to"
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endterm="sql-rollback-to-title">.) Destroying a savepoint when
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it is no longer needed allows the system to reclaim some resources
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earlier than transaction end.
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</para>
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<para>
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<command>RELEASE SAVEPOINT</command> also destroys all savepoints that were
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established after the named savepoint was established.
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</para>
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</refsect1>
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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>savepoint_name</replaceable></term>
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<listitem>
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<para>
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The name of the savepoint to destroy.
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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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Specifying a savepoint name that was not previously defined is an error.
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</para>
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<para>
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It is not possible to release a savepoint when the transaction is in
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an aborted state.
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</para>
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<para>
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If multiple savepoints have the same name, only the one that was most
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recently defined is released.
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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 establish and later destroy a savepoint:
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<programlisting>
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BEGIN;
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INSERT INTO table1 VALUES (3);
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SAVEPOINT my_savepoint;
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INSERT INTO table1 VALUES (4);
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RELEASE SAVEPOINT my_savepoint;
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COMMIT;
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</programlisting>
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The above transaction will insert both 3 and 4.
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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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This command conforms to the <acronym>SQL</> standard. The standard
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specifies that the key word <literal>SAVEPOINT</literal> is
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mandatory, but <productname>PostgreSQL</productname> allows it to
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be omitted.
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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-begin" endterm="sql-begin-title"></member>
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<member><xref linkend="sql-commit" endterm="sql-commit-title"></member>
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<member><xref linkend="sql-rollback" endterm="sql-rollback-title"></member>
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<member><xref linkend="sql-rollback-to" endterm="sql-rollback-to-title"></member>
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<member><xref linkend="sql-savepoint" endterm="sql-savepoint-title"></member>
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</simplelist>
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</refsect1>
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</refentry>
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