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><H1
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><A
NAME="VIEW-PG-REPLICATION-SLOTS"
>50.71. <TT
CLASS="STRUCTNAME"
>pg_replication_slots</TT
></A
></H1
><P
>   The <TT
CLASS="STRUCTNAME"
>pg_replication_slots</TT
> view provides a listing
   of all replication slots that currently exist on the database cluster,
   along with their current state.
  </P
><P
>   For more on replication slots,
   see <A
HREF="warm-standby.html#STREAMING-REPLICATION-SLOTS"
>Section 26.2.6</A
> and <A
HREF="logicaldecoding.html"
>Chapter 47</A
>.
  </P
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><P
><B
>Table 50-72. <TT
CLASS="STRUCTNAME"
>pg_replication_slots</TT
> Columns</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><COL><COL><THEAD
><TR
><TH
>Name</TH
><TH
>Type</TH
><TH
>References</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>slot_name</TT
></TD
><TD
><TT
CLASS="TYPE"
>name</TT
></TD
><TD
>&nbsp;</TD
><TD
>A unique, cluster-wide identifier for the replication slot</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>plugin</TT
></TD
><TD
><TT
CLASS="TYPE"
>name</TT
></TD
><TD
>&nbsp;</TD
><TD
>The base name of the shared object containing the output plugin this logical slot is using, or null for physical slots.</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>slot_type</TT
></TD
><TD
><TT
CLASS="TYPE"
>text</TT
></TD
><TD
>&nbsp;</TD
><TD
>The slot type - <TT
CLASS="LITERAL"
>physical</TT
> or <TT
CLASS="LITERAL"
>logical</TT
></TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>datoid</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-database.html"
><TT
CLASS="STRUCTNAME"
>pg_database</TT
></A
>.oid</TT
></TD
><TD
>The OID of the database this slot is associated with, or
      null. Only logical slots have an associated database.</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>database</TT
></TD
><TD
><TT
CLASS="TYPE"
>text</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-database.html"
><TT
CLASS="STRUCTNAME"
>pg_database</TT
></A
>.datname</TT
></TD
><TD
>The name of the database this slot is associated with, or
      null. Only logical slots have an associated database.</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>active</TT
></TD
><TD
><TT
CLASS="TYPE"
>boolean</TT
></TD
><TD
>&nbsp;</TD
><TD
>True if this slot is currently actively being used</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>active_pid</TT
></TD
><TD
><TT
CLASS="TYPE"
>integer</TT
></TD
><TD
>&nbsp;</TD
><TD
>The process ID of the session using this slot if the slot
       is currently actively being used. <TT
CLASS="LITERAL"
>NULL</TT
> if
       inactive.
      </TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>xmin</TT
></TD
><TD
><TT
CLASS="TYPE"
>xid</TT
></TD
><TD
>&nbsp;</TD
><TD
>The oldest transaction that this slot needs the database to
      retain.  <TT
CLASS="LITERAL"
>VACUUM</TT
> cannot remove tuples deleted
      by any later transaction.
      </TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>catalog_xmin</TT
></TD
><TD
><TT
CLASS="TYPE"
>xid</TT
></TD
><TD
>&nbsp;</TD
><TD
>The oldest transaction affecting the system catalogs that this
      slot needs the database to retain.  <TT
CLASS="LITERAL"
>VACUUM</TT
> cannot
      remove catalog tuples deleted by any later transaction.
      </TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>restart_lsn</TT
></TD
><TD
><TT
CLASS="TYPE"
>pg_lsn</TT
></TD
><TD
>&nbsp;</TD
><TD
>The address (<TT
CLASS="LITERAL"
>LSN</TT
>) of oldest WAL which still
      might be required by the consumer of this slot and thus won't be
      automatically removed during checkpoints.
      </TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>confirmed_flush_lsn</TT
></TD
><TD
><TT
CLASS="TYPE"
>pg_lsn</TT
></TD
><TD
>&nbsp;</TD
><TD
>The address (<TT
CLASS="LITERAL"
>LSN</TT
>) up to which the logical
      slot's consumer has confirmed receiving data. Data older than this is
      not available anymore. <TT
CLASS="LITERAL"
>NULL</TT
> for physical slots.
      </TD
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