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+<!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>54.19. 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 Vsnapshot" /><link rel="prev" href="view-pg-replication-origin-status.html" title="54.18. pg_replication_origin_status" /><link rel="next" href="view-pg-roles.html" title="54.20. pg_roles" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">54.19. <code 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="54.18. pg_replication_origin_status">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="views.html" title="Chapter 54. System Views">Up</a></td><th width="60%" align="center">Chapter 54. System Views</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 16.2 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="view-pg-roles.html" title="54.20. pg_roles">Next</a></td></tr></table><hr /></div><div class="sect1" id="VIEW-PG-REPLICATION-SLOTS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">54.19. <code class="structname">pg_replication_slots</code> <a href="#VIEW-PG-REPLICATION-SLOTS" class="id_link">#</a></h2></div></div></div><a id="id-1.10.5.23.2" class="indexterm"></a><p>
+ The <code class="structname">pg_replication_slots</code> 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 class="xref" href="warm-standby.html#STREAMING-REPLICATION-SLOTS" title="27.2.6. Replication Slots">Section 27.2.6</a> and <a class="xref" href="logicaldecoding.html" title="Chapter 49. Logical Decoding">Chapter 49</a>.
+ </p><div class="table" id="id-1.10.5.23.5"><p class="title"><strong>Table 54.19. <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 /></colgroup><thead><tr><th class="catalog_table_entry"><p class="column_definition">
+ Column Type
+ </p>
+ <p>
+ Description
+ </p></th></tr></thead><tbody><tr><td class="catalog_table_entry"><p class="column_definition">
+ <code class="structfield">slot_name</code> <code class="type">name</code>
+ </p>
+ <p>
+ A unique, cluster-wide identifier for the replication slot
+ </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
+ <code class="structfield">plugin</code> <code class="type">name</code>
+ </p>
+ <p>
+ The base name of the shared object containing the output plugin this logical slot is using, or null for physical slots.
+ </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
+ <code class="structfield">slot_type</code> <code class="type">text</code>
+ </p>
+ <p>
+ The slot type: <code class="literal">physical</code> or <code class="literal">logical</code>
+ </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
+ <code class="structfield">datoid</code> <code class="type">oid</code>
+ (references <a class="link" href="catalog-pg-database.html" title="53.15. pg_database"><code class="structname">pg_database</code></a>.<code class="structfield">oid</code>)
+ </p>
+ <p>
+ The OID of the database this slot is associated with, or
+ null. Only logical slots have an associated database.
+ </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
+ <code class="structfield">database</code> <code class="type">name</code>
+ (references <a class="link" href="catalog-pg-database.html" title="53.15. pg_database"><code class="structname">pg_database</code></a>.<code class="structfield">datname</code>)
+ </p>
+ <p>
+ The name of the database this slot is associated with, or
+ null. Only logical slots have an associated database.
+ </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
+ <code class="structfield">temporary</code> <code class="type">bool</code>
+ </p>
+ <p>
+ True if this is a temporary replication slot. Temporary slots are
+ not saved to disk and are automatically dropped on error or when
+ the session has finished.
+ </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
+ <code class="structfield">active</code> <code class="type">bool</code>
+ </p>
+ <p>
+ True if this slot is currently actively being used
+ </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
+ <code class="structfield">active_pid</code> <code class="type">int4</code>
+ </p>
+ <p>
+ The process ID of the session using this slot if the slot
+ is currently actively being used. <code class="literal">NULL</code> if
+ inactive.
+ </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
+ <code class="structfield">xmin</code> <code class="type">xid</code>
+ </p>
+ <p>
+ The oldest transaction that this slot needs the database to
+ retain. <code class="literal">VACUUM</code> cannot remove tuples deleted
+ by any later transaction.
+ </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
+ <code class="structfield">catalog_xmin</code> <code class="type">xid</code>
+ </p>
+ <p>
+ The oldest transaction affecting the system catalogs that this
+ slot needs the database to retain. <code class="literal">VACUUM</code> cannot
+ remove catalog tuples deleted by any later transaction.
+ </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
+ <code class="structfield">restart_lsn</code> <code class="type">pg_lsn</code>
+ </p>
+ <p>
+ The address (<code class="literal">LSN</code>) of oldest WAL which still
+ might be required by the consumer of this slot and thus won't be
+ automatically removed during checkpoints unless this LSN
+ gets behind more than <a class="xref" href="runtime-config-replication.html#GUC-MAX-SLOT-WAL-KEEP-SIZE">max_slot_wal_keep_size</a>
+ from the current LSN. <code class="literal">NULL</code>
+ if the <code class="literal">LSN</code> of this slot has never been reserved.
+ </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
+ <code class="structfield">confirmed_flush_lsn</code> <code class="type">pg_lsn</code>
+ </p>
+ <p>
+ The address (<code class="literal">LSN</code>) up to which the logical
+ slot's consumer has confirmed receiving data. Data corresponding to the
+ transactions committed before this <code class="literal">LSN</code> is not
+ available anymore. <code class="literal">NULL</code> for physical slots.
+ </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
+ <code class="structfield">wal_status</code> <code class="type">text</code>
+ </p>
+ <p>
+ Availability of WAL files claimed by this slot.
+ Possible values are:
+ </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p><code class="literal">reserved</code> means that the claimed files
+ are within <code class="varname">max_wal_size</code>.</p></li><li class="listitem"><p><code class="literal">extended</code> means
+ that <code class="varname">max_wal_size</code> is exceeded but the files are
+ still retained, either by the replication slot or
+ by <code class="varname">wal_keep_size</code>.
+ </p></li><li class="listitem"><p>
+ <code class="literal">unreserved</code> means that the slot no longer
+ retains the required WAL files and some of them are to be removed at
+ the next checkpoint. This state can return
+ to <code class="literal">reserved</code> or <code class="literal">extended</code>.
+ </p></li><li class="listitem"><p>
+ <code class="literal">lost</code> means that some required WAL files have
+ been removed and this slot is no longer usable.
+ </p></li></ul></div><p>
+ The last two states are seen only when
+ <a class="xref" href="runtime-config-replication.html#GUC-MAX-SLOT-WAL-KEEP-SIZE">max_slot_wal_keep_size</a> is
+ non-negative. If <code class="structfield">restart_lsn</code> is NULL, this
+ field is null.
+ </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
+ <code class="structfield">safe_wal_size</code> <code class="type">int8</code>
+ </p>
+ <p>
+ The number of bytes that can be written to WAL such that this slot
+ is not in danger of getting in state "lost". It is NULL for lost
+ slots, as well as if <code class="varname">max_slot_wal_keep_size</code>
+ is <code class="literal">-1</code>.
+ </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
+ <code class="structfield">two_phase</code> <code class="type">bool</code>
+ </p>
+ <p>
+ True if the slot is enabled for decoding prepared transactions. Always
+ false for physical slots.
+ </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
+ <code class="structfield">conflicting</code> <code class="type">bool</code>
+ </p>
+ <p>
+ True if this logical slot conflicted with recovery (and so is now
+ invalidated). Always NULL for physical slots.
+ </p></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" title="54.18. pg_replication_origin_status">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="views.html" title="Chapter 54. System Views">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="view-pg-roles.html" title="54.20. pg_roles">Next</a></td></tr><tr><td width="40%" align="left" valign="top">54.18. <code class="structname">pg_replication_origin_status</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 16.2 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 54.20. <code class="structname">pg_roles</code></td></tr></table></div></body></html> \ No newline at end of file
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