role="column_definition">
       Column Type
      </para>
      <para>
       Description
      </para></entry>
     </row>
    </thead>

    <tbody>
     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>local_id</structfield> <type>oid</type>
       (references <link linkend="catalog-pg-replication-origin"><structname>pg_replication_origin</structname></link>.<structfield>roident</structfield>)
      </para>
      <para>
       internal node identifier
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>external_id</structfield> <type>text</type>
       (references <link linkend="catalog-pg-replication-origin"><structname>pg_replication_origin</structname></link>.<structfield>roname</structfield>)
      </para>
      <para>
       external node identifier
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>remote_lsn</structfield> <type>pg_lsn</type>
      </para>
      <para>
       The origin node's LSN up to which data has been replicated.
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>local_lsn</structfield> <type>pg_lsn</type>
      </para>
      <para>
       This node's LSN at which <literal>remote_lsn</literal> has
       been replicated. Used to flush commit records before persisting
       data to disk when using asynchronous commits.
      </para></entry>
     </row>
    </tbody>
   </tgroup>
  </table>
 </sect1>

 <sect1 id="view-pg-replication-slots">
  <title><structname>pg_replication_slots</structname></title>

  <indexterm zone="view-pg-replication-slots">
   <primary>pg_replication_slots</primary>
  </indexterm>

  <para>
   The <structname>pg_replication_slots</structname> view provides a listing
   of all replication slots that currently exist on the database cluster,
   along with their current state.
  </para>

  <para>
   For more on replication slots,
   see <xref linkend="streaming-replication-slots"/> and <xref linkend="logicaldecoding"/>.
  </para>

  <table>
   <title><structname>pg_replication_slots</structname> Columns</title>
   <tgroup cols="1">
    <thead>
     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       Column Type
      </para>
      <para>
       Description
      </para></entry>
     </row>
    </thead>

    <tbody>
     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>slot_name</structfield> <type>name</type>
      </para>
      <para>
       A unique, cluster-wide identifier for the replication slot
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>plugin</structfield> <type>name</type>
      </para>
      <para>
       The base name of the shared object containing the output plugin this logical slot is using, or null for physical slots.
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>slot_type</structfield> <type>text</type>
      </para>
      <para>
       The slot type: <literal>physical</literal> or <literal>logical</literal>
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>datoid</structfield> <type>oid</type>
       (references <link linkend="catalog-pg-database"><structname>pg_database</structname></link>.<structfield>oid</structfield>)
      </para>
      <para>
       The OID of the database this slot is associated with, or
       null. Only logical slots have an associated database.
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>database</structfield>