<!--
doc/src/sgml/ref/alter_subscription.sgml
PostgreSQL documentation
-->

<refentry id="sql-altersubscription">
 <indexterm zone="sql-altersubscription">
  <primary>ALTER SUBSCRIPTION</primary>
 </indexterm>

 <refmeta>
  <refentrytitle>ALTER SUBSCRIPTION</refentrytitle>
  <manvolnum>7</manvolnum>
  <refmiscinfo>SQL - Language Statements</refmiscinfo>
 </refmeta>

 <refnamediv>
  <refname>ALTER SUBSCRIPTION</refname>
  <refpurpose>change the definition of a subscription</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
<synopsis>
ALTER SUBSCRIPTION <replaceable class="parameter">name</replaceable> CONNECTION '<replaceable>conninfo</replaceable>'
ALTER SUBSCRIPTION <replaceable class="parameter">name</replaceable> SET PUBLICATION <replaceable class="parameter">publication_name</replaceable> [, ...] [ WITH ( <replaceable class="parameter">set_publication_option</replaceable> [= <replaceable class="parameter">value</replaceable>] [, ... ] ) ]
ALTER SUBSCRIPTION <replaceable class="parameter">name</replaceable> REFRESH PUBLICATION [ WITH ( <replaceable class="parameter">refresh_option</replaceable> [= <replaceable class="parameter">value</replaceable>] [, ... ] ) ]
ALTER SUBSCRIPTION <replaceable class="parameter">name</replaceable> ENABLE
ALTER SUBSCRIPTION <replaceable class="parameter">name</replaceable> DISABLE
ALTER SUBSCRIPTION <replaceable class="parameter">name</replaceable> SET ( <replaceable class="parameter">subscription_parameter</replaceable> [= <replaceable class="parameter">value</replaceable>] [, ... ] )
ALTER SUBSCRIPTION <replaceable class="parameter">name</replaceable> OWNER TO { <replaceable>new_owner</replaceable> | CURRENT_USER | SESSION_USER }
ALTER SUBSCRIPTION <replaceable class="parameter">name</replaceable> RENAME TO <replaceable>new_name</replaceable>
</synopsis>
 </refsynopsisdiv>

 <refsect1>
  <title>Description</title>

  <para>
   <command>ALTER SUBSCRIPTION</command> can change most of the subscription
   properties that can be specified
   in <xref linkend="sql-createsubscription"/>.
  </para>

  <para>
   You must own the subscription to use <command>ALTER SUBSCRIPTION</command>.
   To alter the owner, you must also be a direct or indirect member of the
   new owning role. The new owner has to be a superuser.
   (Currently, all subscription owners must be superusers, so the owner checks
   will be bypassed in practice.  But this might change in the future.)
  </para>
 </refsect1>

 <refsect1>
  <title>Parameters</title>

  <variablelist>
   <varlistentry>
    <term><replaceable class="parameter">name</replaceable></term>
    <listitem>
     <para>
      The name of a subscription whose properties are to be altered.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><literal>CONNECTION '<replaceable class="parameter">conninfo</replaceable>'</literal></term>
    <listitem>
     <para>
      This clause alters the connection property originally set by
      <xref linkend="sql-createsubscription"/>.  See there for more
      information.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><literal>SET PUBLICATION <replaceable class="parameter">publication_name</replaceable></literal></term>
    <listitem>
     <para>
      Changes list of subscribed publications. See
      <xref linkend="sql-createsubscription"/> for more information.
      By default this command will also act like <literal>REFRESH
      PUBLICATION</literal>.
     </para>

     <para>
      <replaceable>set_publication_option</replaceable> specifies additional
      options for this operation.  The supported options are:

      <variablelist>
       <varlistentry>
        <term><literal>refresh</literal> (<type>boolean</type>)</term>
        <listitem>
         <para>
          When false, the command will not try to refresh table information.
          <literal>REFRESH PUBLICATION</literal> should then be executed separately.
          The default is <literal>true</literal>.
         </para>
        </listitem>
       </varlistentry>
      </variablelist>

      Additionally, refresh options as described
      under <literal>REFRESH PUBLICATION</literal> may be specified.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><literal>REFRESH PUBLICATION</literal></term>
    <listitem>
     <para>
      Fetch missing table information from publisher.  This will start
      replication of tables that were added to the subscribed-to publications
      since the last invocation of <command>REFRESH PUBLICATION</command> or
      since <command>CREATE SUBSCRIPTION</command>.
     </para>

     <para>
      <replaceable>refresh_option</replaceable> specifies additional options for the
      refresh operation.  The supported options are:

      <variablelist>
       <varlistentry>
        <term><literal>copy_data</literal> (<type>boolean</type>)</term>
        <listitem>
         <para>
          Specifies whether the existing data in the publications that are
          being subscribed to should be copied once the replication starts.
          The default is <literal>true</literal>.  (Previously subscribed
          tables are not copied.)
         </para>
        </listitem>
       </varlistentry>
      </variablelist>
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><literal>ENABLE</literal></term>
    <listitem>
     <para>
      Enables the previously disabled subscription, starting the logical
      replication worker at the end of transaction.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><literal>DISABLE</literal></term>
    <listitem>
     <para>
      Disables the running subscription, stopping the logical replication
      worker at the end of transaction.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><literal>SET ( <replaceable class="parameter">subscription_parameter</replaceable> [= <replaceable class="parameter">value</replaceable>] [, ... ] )</literal></term>
    <listitem>
     <para>
      This clause alters parameters originally set by
      <xref linkend="sql-createsubscription"/>.  See there for more
      information.  The allowed options are <literal>slot_name</literal> and
      <literal>synchronous_commit</literal>
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">new_owner</replaceable></term>
    <listitem>
     <para>
      The user name of the new owner of the subscription.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">new_name</replaceable></term>
    <listitem>
     <para>
      The new name for the subscription.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>

 <refsect1>
  <title>Examples</title>

  <para>
   Change the publication subscribed by a subscription to
   <literal>insert_only</literal>:
<programlisting>
ALTER SUBSCRIPTION mysub SET PUBLICATION insert_only;
</programlisting>
  </para>

  <para>
   Disable (stop) the subscription:
<programlisting>
ALTER SUBSCRIPTION mysub DISABLE;
</programlisting></para>
 </refsect1>

 <refsect1>
  <title>Compatibility</title>

  <para>
   <command>ALTER SUBSCRIPTION</command> is a <productname>PostgreSQL</productname>
   extension.
  </para>
 </refsect1>

 <refsect1>
  <title>See Also</title>

  <simplelist type="inline">
   <member><xref linkend="sql-createsubscription"/></member>
   <member><xref linkend="sql-dropsubscription"/></member>
   <member><xref linkend="sql-createpublication"/></member>
   <member><xref linkend="sql-alterpublication"/></member>
  </simplelist>
 </refsect1>
</refentry>
