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diff --git a/doc/src/sgml/html/view-pg-replication-slots.html b/doc/src/sgml/html/view-pg-replication-slots.html new file mode 100644 index 0000000..bdb96f1 --- /dev/null +++ b/doc/src/sgml/html/view-pg-replication-slots.html @@ -0,0 +1,131 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!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 15.5 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></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 older than this 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></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. 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