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Green_GoodERP18_FSJ_Standard/PostgreSQL/doc/postgresql/html/view-pg-replication-slots.html

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  1. <?xml version="1.0" encoding="UTF-8" standalone="no"?>

  2. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>51.81. pg_replication_slots</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="prev" href="view-pg-replication-origin-status.html" title="51.80. pg_replication_origin_status" /><link rel="next" href="view-pg-roles.html" title="51.82. pg_roles" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">51.81. <code xmlns="http://www.w3.org/1999/xhtml" class="structname">pg_replication_slots</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="view-pg-replication-origin-status.html" title="51.80. pg_replication_origin_status">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="catalogs.html" title="Chapter 51. System Catalogs">Up</a></td><th width="60%" align="center">Chapter 51. System Catalogs</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 12.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="view-pg-roles.html" title="51.82. pg_roles">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="VIEW-PG-REPLICATION-SLOTS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">51.81. <code class="structname">pg_replication_slots</code></h2></div></div></div><a id="id-1.10.4.83.2" class="indexterm"></a><p>

  3.    The <code class="structname">pg_replication_slots</code> view provides a listing

  4.    of all replication slots that currently exist on the database cluster,

  5.    along with their current state.

  6.   </p><p>

  7.    For more on replication slots,

  8.    see <a class="xref" href="warm-standby.html#STREAMING-REPLICATION-SLOTS" title="26.2.6. Replication Slots">Section 26.2.6</a> and <a class="xref" href="logicaldecoding.html" title="Chapter 48. Logical Decoding">Chapter 48</a>.

  9.   </p><div class="table" id="id-1.10.4.83.5"><p class="title"><strong>Table 51.82. <code class="structname">pg_replication_slots</code> Columns</strong></p><div class="table-contents"><table class="table" summary="pg_replication_slots Columns" border="1"><colgroup><col /><col /><col /><col /></colgroup><thead><tr><th>Name</th><th>Type</th><th>References</th><th>Description</th></tr></thead><tbody><tr><td><code class="structfield">slot_name</code></td><td><code class="type">name</code></td><td> </td><td>A unique, cluster-wide identifier for the replication slot</td></tr><tr><td><code class="structfield">plugin</code></td><td><code class="type">name</code></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><code class="structfield">slot_type</code></td><td><code class="type">text</code></td><td> </td><td>The slot type - <code class="literal">physical</code> or <code class="literal">logical</code></td></tr><tr><td><code class="structfield">datoid</code></td><td><code class="type">oid</code></td><td><code class="literal"><a class="link" href="catalog-pg-database.html" title="51.15. pg_database"><code class="structname">pg_database</code></a>.oid</code></td><td>The OID of the database this slot is associated with, or

  10.       null. Only logical slots have an associated database.</td></tr><tr><td><code class="structfield">database</code></td><td><code class="type">text</code></td><td><code class="literal"><a class="link" href="catalog-pg-database.html" title="51.15. pg_database"><code class="structname">pg_database</code></a>.datname</code></td><td>The name of the database this slot is associated with, or

  11.       null. Only logical slots have an associated database.</td></tr><tr><td><code class="structfield">temporary</code></td><td><code class="type">boolean</code></td><td> </td><td>True if this is a temporary replication slot. Temporary slots are

  12.       not saved to disk and are automatically dropped on error or when

  13.       the session has finished.</td></tr><tr><td><code class="structfield">active</code></td><td><code class="type">boolean</code></td><td> </td><td>True if this slot is currently actively being used</td></tr><tr><td><code class="structfield">active_pid</code></td><td><code class="type">integer</code></td><td> </td><td>The process ID of the session using this slot if the slot

  14.        is currently actively being used. <code class="literal">NULL</code> if

  15.        inactive.

  16.       </td></tr><tr><td><code class="structfield">xmin</code></td><td><code class="type">xid</code></td><td> </td><td>The oldest transaction that this slot needs the database to

  17.       retain.  <code class="literal">VACUUM</code> cannot remove tuples deleted

  18.       by any later transaction.

  19.       </td></tr><tr><td><code class="structfield">catalog_xmin</code></td><td><code class="type">xid</code></td><td> </td><td>The oldest transaction affecting the system catalogs that this

  20.       slot needs the database to retain.  <code class="literal">VACUUM</code> cannot

  21.       remove catalog tuples deleted by any later transaction.

  22.       </td></tr><tr><td><code class="structfield">restart_lsn</code></td><td><code class="type">pg_lsn</code></td><td> </td><td>The address (<code class="literal">LSN</code>) of oldest WAL which still

  23.       might be required by the consumer of this slot and thus won't be

  24.       automatically removed during checkpoints.  <code class="literal">NULL</code>

  25.       if the <code class="literal">LSN</code> of this slot has never been reserved.

  26.       </td></tr><tr><td><code class="structfield">confirmed_flush_lsn</code></td><td><code class="type">pg_lsn</code></td><td> </td><td>The address (<code class="literal">LSN</code>) up to which the logical

  27.       slot's consumer has confirmed receiving data. Data older than this is

  28.       not available anymore. <code class="literal">NULL</code> for physical slots.

  29.       </td></tr></tbody></table></div></div><br class="table-break" /></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="view-pg-replication-origin-status.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="catalogs.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="view-pg-roles.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">51.80. <code class="structname">pg_replication_origin_status</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 51.82. <code class="structname">pg_roles</code></td></tr></table></div></body></html>
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