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Since some preparation work had already been done, the only source changes left were changing empty-element tags like <xref linkend="foo"> to <xref linkend="foo"/>, and changing the DOCTYPE. The source files are still named *.sgml, but they are actually XML files now. Renaming could be considered later. In the build system, the intermediate step to convert from SGML to XML is removed. Everything is build straight from the source files again. The OpenSP (or the old SP) package is no longer needed. The documentation toolchain instructions are updated and are much simpler now. Peter Eisentraut, Alexander Lakhin, Jürgen Purtz
131 lines
3.6 KiB
Plaintext
131 lines
3.6 KiB
Plaintext
<!--
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doc/src/sgml/ref/drop_subscription.sgml
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PostgreSQL documentation
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-->
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<refentry id="sql-dropsubscription">
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<indexterm zone="sql-dropsubscription">
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<primary>DROP SUBSCRIPTION</primary>
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</indexterm>
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<refmeta>
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<refentrytitle>DROP SUBSCRIPTION</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>DROP SUBSCRIPTION</refname>
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<refpurpose>remove a subscription</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<synopsis>
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DROP SUBSCRIPTION [ IF EXISTS ] <replaceable class="parameter">name</replaceable> [ CASCADE | RESTRICT ]
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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>DROP SUBSCRIPTION</command> removes a subscription from the
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database cluster.
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</para>
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<para>
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A subscription can only be dropped by a superuser.
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</para>
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<para>
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<command>DROP SUBSCRIPTION</command> cannot be executed inside a
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transaction block if the subscription is associated with a replication
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slot. (You can use <command>ALTER SUBSCRIPTION</command> to unset the
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slot.)
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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 class="parameter">name</replaceable></term>
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<listitem>
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<para>
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The name of a subscription to be dropped.
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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><literal>CASCADE</literal></term>
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<term><literal>RESTRICT</literal></term>
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<listitem>
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<para>
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These key words do not have any effect, since there are no dependencies
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on subscriptions.
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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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When dropping a subscription that is associated with a replication slot on
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the remote host (the normal state), <command>DROP SUBSCRIPTION</command>
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will connect to the remote host and try to drop the replication slot as
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part of its operation. This is necessary so that the resources allocated
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for the subscription on the remote host are released. If this fails,
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either because the remote host is not reachable or because the remote
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replication slot cannot be dropped or does not exist or never existed,
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the <command>DROP SUBSCRIPTION</command> command will fail. To proceed in
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this situation, disassociate the subscription from the replication slot by
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executing <literal>ALTER SUBSCRIPTION ... SET (slot_name = NONE)</literal>.
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After that, <command>DROP SUBSCRIPTION</command> will no longer attempt any
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actions on a remote host. Note that if the remote replication slot still
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exists, it should then be dropped manually; otherwise it will continue to
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reserve WAL and might eventually cause the disk to fill up. See
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also <xref linkend="logical-replication-subscription-slot"/>.
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</para>
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<para>
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If a subscription is associated with a replication slot, then <command>DROP
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SUBSCRIPTION</command> cannot be executed inside a transaction block.
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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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Drop a subscription:
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<programlisting>
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DROP SUBSCRIPTION mysub;
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</programlisting></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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<command>DROP SUBSCRIPTION</command> is a <productname>PostgreSQL</productname>
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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-createsubscription"/></member>
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<member><xref linkend="sql-altersubscription"/></member>
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</simplelist>
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</refsect1>
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</refentry>
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