<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >pg_replication_slots</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REV="MADE" HREF="mailto:pgsql-docs@postgresql.org"><LINK REL="HOME" TITLE="PostgreSQL 9.4.12 Documentation" HREF="index.html"><LINK REL="UP" TITLE="System Catalogs" HREF="catalogs.html"><LINK REL="PREVIOUS" TITLE="pg_rewrite" HREF="catalog-pg-rewrite.html"><LINK REL="NEXT" TITLE="pg_seclabel" HREF="catalog-pg-seclabel.html"><LINK REL="STYLESHEET" TYPE="text/css" HREF="stylesheet.css"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1"><META NAME="creation" CONTENT="2017-07-13T18:41:18"></HEAD ><BODY CLASS="SECT1" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="4" ALIGN="center" VALIGN="bottom" ><A HREF="index.html" >PostgreSQL 9.4.12 Documentation</A ></TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A TITLE="pg_rewrite" HREF="catalog-pg-rewrite.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="catalogs.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" >Chapter 48. System Catalogs</TD ><TD WIDTH="20%" ALIGN="right" VALIGN="top" ><A TITLE="pg_seclabel" HREF="catalog-pg-seclabel.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="CATALOG-PG-REPLICATION-SLOTS" >48.39. <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 25.2.6</A > and <A HREF="logicaldecoding.html" >Chapter 46</A >. </P ><DIV CLASS="TABLE" ><A NAME="AEN99598" ></A ><P ><B >Table 48-39. <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 > </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 > </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 > </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 > </TD ><TD >True if this slot is currently actively being used</TD ></TR ><TR ><TD ><TT CLASS="STRUCTFIELD" >xmin</TT ></TD ><TD ><TT CLASS="TYPE" >xid</TT ></TD ><TD > </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 > </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 > </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 ></TBODY ></TABLE ></DIV ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="catalog-pg-rewrite.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="catalog-pg-seclabel.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><TT CLASS="STRUCTNAME" >pg_rewrite</TT ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="catalogs.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><TT CLASS="STRUCTNAME" >pg_seclabel</TT ></TD ></TR ></TABLE ></DIV ></BODY ></HTML >