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

<refentry id="sql-alterpublication">
 <indexterm zone="sql-alterpublication">
  <primary>ALTER PUBLICATION</primary>
 </indexterm>

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

 <refnamediv>
  <refname>ALTER PUBLICATION</refname>
  <refpurpose>change the definition of a publication</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
<synopsis>
ALTER PUBLICATION <replaceable class="parameter">name</replaceable> ADD <replaceable class="parameter">publication_object</replaceable> [, ...]
ALTER PUBLICATION <replaceable class="parameter">name</replaceable> SET <replaceable class="parameter">publication_object</replaceable> [, ...]
ALTER PUBLICATION <replaceable class="parameter">name</replaceable> DROP <replaceable class="parameter">publication_drop_object</replaceable> [, ...]
ALTER PUBLICATION <replaceable class="parameter">name</replaceable> SET ( <replaceable class="parameter">publication_parameter</replaceable> [= <replaceable class="parameter">value</replaceable>] [, ... ] )
ALTER PUBLICATION <replaceable class="parameter">name</replaceable> OWNER TO { <replaceable>new_owner</replaceable> | CURRENT_ROLE | CURRENT_USER | SESSION_USER }
ALTER PUBLICATION <replaceable class="parameter">name</replaceable> RENAME TO <replaceable>new_name</replaceable>

<phrase>where <replaceable class="parameter">publication_object</replaceable> is one of:</phrase>

    TABLE <replaceable class="parameter">table_and_columns</replaceable> [, ... ]
    TABLES IN SCHEMA { <replaceable class="parameter">schema_name</replaceable> | CURRENT_SCHEMA } [, ... ]

<phrase>and <replaceable class="parameter">publication_drop_object</replaceable> is one of:</phrase>

    TABLE [ ONLY ] <replaceable class="parameter">table_name</replaceable> [ * ] [, ... ]
    TABLES IN SCHEMA { <replaceable class="parameter">schema_name</replaceable> | CURRENT_SCHEMA } [, ... ]

<phrase>and <replaceable class="parameter">table_and_columns</replaceable> is:</phrase>

    [ ONLY ] <replaceable class="parameter">table_name</replaceable> [ * ] [ ( <replaceable class="parameter">column_name</replaceable> [, ... ] ) ] [ WHERE ( <replaceable class="parameter">expression</replaceable> ) ]
</synopsis>
 </refsynopsisdiv>

 <refsect1>
  <title>Description</title>

  <para>
   The command <command>ALTER PUBLICATION</command> can change the attributes
   of a publication.
  </para>

  <para>
   The first three variants change which tables/schemas are part of the
   publication.  The <literal>SET</literal> clause will replace the list of
   tables/schemas in the publication with the specified list; the existing
   tables/schemas that were present in the publication will be removed.  The
   <literal>ADD</literal> and <literal>DROP</literal> clauses will add and
   remove one or more tables/schemas from the publication.  Note that adding
   tables/schemas to a publication that is already subscribed to will require an
   <link linkend="sql-altersubscription-params-refresh-publication">
   <literal>ALTER SUBSCRIPTION ... REFRESH PUBLICATION</literal></link> action on the
   subscribing side in order to become effective. Note also that
   <literal>DROP TABLES IN SCHEMA</literal> will not drop any schema tables
   that were specified using
   <link linkend="sql-createpublication-params-for-table"><literal>FOR TABLE</literal></link>/
   <literal>ADD TABLE</literal>.
  </para>

  <para>
   The fourth variant of this command listed in the synopsis can change
   all of the publication properties specified in
   <xref linkend="sql-createpublication"/>.  Properties not mentioned in the
   command retain their previous settings.
  </para>

  <para>
   The remaining variants change the owner and the name of the publication.
  </para>

  <para>
   You must own the publication to use <command>ALTER PUBLICATION</command>.
   Adding a table to a publication additionally requires owning that table.
   The <literal>ADD TABLES IN SCHEMA</literal> and
   <literal>SET TABLES IN SCHEMA</literal> to a publication requires the
   invoking user to be a superuser.
   To alter the owner, you must be able to <literal>SET ROLE</literal> to the
   new owning role, and that role must have <literal>CREATE</literal>
   privilege on the database.
   Also, the new owner of a
   <link linkend="sql-createpublication-params-for-tables-in-schema"><literal>FOR TABLES IN SCHEMA</literal></link>
   or <link linkend="sql-createpublication-params-for-all-tables"><literal>FOR ALL TABLES</literal></link>
   or <link linkend="sql-createpublication-params-for-all-sequences"><literal>FOR ALL SEQUENCES</literal></link>
   publication must be a superuser. However, a superuser can
   change the ownership of a publication regardless of these restrictions.
  </para>

  <para>
   Adding/Setting any schema when the publication also publishes a table with a
   column list, and vice versa is not supported.
  </para>
 </refsect1>

 <refsect1>
  <title>Parameters</title>

  <variablelist>
   <varlistentry>
    <term><replaceable class="parameter">name</replaceable></term>
    <listitem>
     <para>
      The name of an existing publication whose definition is to be altered.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">table_name</replaceable></term>
    <listitem>
     <para>
      Name of an existing table.  If <literal>ONLY</literal> is specified before the
      table name, only that table is affected.  If <literal>ONLY</literal> is not
      specified, the table and all its descendant tables (if any) are
      affected.  Optionally, <literal>*</literal> can be specified after the table
      name to explicitly indicate that descendant tables are included.
     </para>

     <para>
      Optionally, a column list can be specified.  See <xref
      linkend="sql-createpublication"/> for details. Note that a subscription
      having several publications in which the same table has been published
      with different column lists is not supported. See
      <xref linkend="logical-replication-col-list-combining"/> for details of
      potential problems when altering column lists.
     </para>

     <para>
      If the optional <literal>WHERE</literal> clause is specified, rows for
      which the <replaceable class="parameter">expression</replaceable>
      evaluates to false or null will not be published. Note that parentheses
      are required around the expression. The
      <replaceable class="parameter">expression</replaceable> is evaluated with
      the role used for the replication connection.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">schema_name</replaceable></term>
    <listitem>
     <para>
      Name of an existing schema.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><literal>SET ( <replaceable class="parameter">publication_parameter</replaceable> [= <replaceable class="parameter">value</replaceable>] [, ... ] )</literal></term>
    <listitem>
     <para>
      This clause alters publication parameters originally set by
      <xref linkend="sql-createpublication"/>.  See there for more information.
      This clause is not applicable to sequences.
     </para>
     <caution>
      <para>
       Altering the <literal>publish_via_partition_root</literal> parameter can
       lead to data loss or duplication at the subscriber because it changes
       the identity and schema of the published tables. Note this happens only
       when a partition root table is specified as the replication target.
      </para>
      <para>
       This problem can be avoided by refraining from modifying partition leaf
       tables after the <command>ALTER PUBLICATION ... SET</command> until the
       <link linkend="sql-altersubscription"><command>ALTER SUBSCRIPTION ... REFRESH PUBLICATION</command></link>
       is executed and by only refreshing using the <literal>copy_data = off</literal>
       option.
      </para>
     </caution>
    </listitem>
   </varlistentry>

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

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

 <refsect1>
  <title>Examples</title>

  <para>
   Change the publication to publish only deletes and updates:
<programlisting>
ALTER PUBLICATION noinsert SET (publish = 'update, delete');
</programlisting>
  </para>

  <para>
   Add some tables to the publication:
<programlisting>
ALTER PUBLICATION mypublication ADD TABLE users (user_id, firstname), departments;
</programlisting></para>

  <para>
   Change the set of columns published for a table:
<programlisting>
ALTER PUBLICATION mypublication SET TABLE users (user_id, firstname, lastname), TABLE departments;
</programlisting></para>

  <para>
   Add schemas <structname>marketing</structname> and
   <structname>sales</structname> to the publication
   <structname>sales_publication</structname>:
<programlisting>
ALTER PUBLICATION sales_publication ADD TABLES IN SCHEMA marketing, sales;
</programlisting>
  </para>

  <para>
   Add tables <structname>users</structname>,
   <structname>departments</structname> and schema
   <structname>production</structname> to the publication
   <structname>production_publication</structname>:
<programlisting>
ALTER PUBLICATION production_publication ADD TABLE users, departments, TABLES IN SCHEMA production;
</programlisting></para>
 </refsect1>

 <refsect1>
  <title>Compatibility</title>

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

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

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