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

<refentry id="SQL-CREATEPUBLICATION">
 <indexterm zone="sql-createpublication">
  <primary>CREATE PUBLICATION</primary>
 </indexterm>

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

 <refnamediv>
  <refname>CREATE PUBLICATION</refname>
  <refpurpose>define a new publication</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
<synopsis>
CREATE PUBLICATION <replaceable class="parameter">name</replaceable>
    [ FOR TABLE [ ONLY ] <replaceable class="parameter">table_name</replaceable> [ * ] [, ...]
      | FOR ALL TABLES ]
    [ WITH ( <replaceable class="parameter">publication_parameter</replaceable> [= <replaceable class="parameter">value</replaceable>] [, ... ] ) ]

</synopsis>
 </refsynopsisdiv>

 <refsect1>
  <title>Description</title>

  <para>
   <command>CREATE PUBLICATION</command> adds a new publication
   into the current database.  The publication name must be distinct from
   the name of any existing publication in the current database.
  </para>

  <para>
   A publication is essentially a group of tables whose data changes are
   intended to be replicated through logical replication.  See
   <xref linkend="logical-replication-publication"> for details about how
   publications fit into the logical replication setup.
   </para>
 </refsect1>

 <refsect1>
  <title>Parameters</title>

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

   <varlistentry>
    <term><literal>FOR TABLE</literal></term>
    <listitem>
     <para>
      Specifies a list of tables to add to the publication.  If
      <literal>ONLY</> is specified before the table name, only
      that table is added to the publication.  If <literal>ONLY</> is not
      specified, the table and all its descendant tables (if any) are added.
      Optionally, <literal>*</> can be specified after the table name to
      explicitly indicate that descendant tables are included.
     </para>

     <para>
      Only persistent base tables can be part of a publication.  Temporary
      tables, unlogged tables, foreign tables, materialized views, regular
      views, and partitioned tables cannot be part of a publication.  To
      replicate a partitioned table, add the individual partitions to the
      publication.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><literal>FOR ALL TABLES</literal></term>
    <listitem>
     <para>
      Marks the publication as one that replicates changes for all tables in
      the database, including tables created in the future.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><literal>WITH ( <replaceable class="parameter">publication_parameter</replaceable> [= <replaceable class="parameter">value</replaceable>] [, ... ] )</literal></term>
    <listitem>
     <para>
      This clause specifies optional parameters for a publication.  The
      following parameters are supported:

      <variablelist>
       <varlistentry>
        <term><literal>publish</literal> (<type>string</type>)</term>
        <listitem>
         <para>
          This parameter determines which DML operations will be published by
          the new publication to the subscribers.  The value is
          comma-separated list of operations.  The allowed operations are
          <literal>insert</literal>, <literal>update</literal>, and
          <literal>delete</literal>.  The default is to publish all actions,
          and so the default value for this option is
          <literal>'insert, update, delete'</literal>.
         </para>
        </listitem>
       </varlistentry>
      </variablelist>

     </para>
    </listitem>
   </varlistentry>

  </variablelist>
 </refsect1>

 <refsect1>
  <title>Notes</title>

  <para>
   If neither <literal>FOR TABLE</literal> nor <literal>FOR ALL
   TABLES</literal> is specified, then the publication starts out with an
   empty set of tables.  That is useful if tables are to be added later.
  </para>

  <para>
   The creation of a publication does not start replication.  It only defines
   a grouping and filtering logic for future subscribers.
  </para>

  <para>
   To create a publication, the invoking user must have the
   <literal>CREATE</> privilege for the current database.
   (Of course, superusers bypass this check.)
  </para>

  <para>
   To add a table to a publication, the invoking user must have ownership
   rights on the table.  The <command>FOR ALL TABLES</command> clause requires
   the invoking user to be a superuser.
  </para>

  <para>
   The tables added to a publication that publishes <command>UPDATE</command>
   and/or <command>DELETE</command> operations must have
   <literal>REPLICA IDENTITY</> defined.  Otherwise those operations will be
   disallowed on those tables.
  </para>

  <para>
   For an <command>INSERT ... ON CONFLICT</> command, the publication will
   publish the operation that actually results from the command.  So depending
   of the outcome, it may be published as either <command>INSERT</command> or
   <command>UPDATE</command>, or it may not be published at all.
  </para>

  <para>
   <command>TRUNCATE</command> and <acronym>DDL</acronym> operations
   are not published.
  </para>
 </refsect1>

 <refsect1>
  <title>Examples</title>

  <para>
   Create a publication that publishes all changes in two tables:
<programlisting>
CREATE PUBLICATION mypublication FOR TABLE users, departments;
</programlisting>
  </para>

  <para>
   Create a publication that publishes all changes in all tables:
<programlisting>
CREATE PUBLICATION alltables FOR ALL TABLES;
</programlisting>
  </para>

  <para>
   Create a publication that only publishes <command>INSERT</command>
   operations in one table:
<programlisting>
CREATE PUBLICATION insert_only FOR TABLE mydata
    WITH (publish = 'insert');
</programlisting>
  </para>
 </refsect1>

 <refsect1>
  <title>Compatibility</title>

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

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

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