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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>31.1. Publication</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="logical-replication.html" title="Chapter 31. Logical Replication" /><link rel="next" href="logical-replication-subscription.html" title="31.2. Subscription" /></head><body id="docContent" class="container-fluid col-10"><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">31.1. Publication</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="logical-replication.html" title="Chapter 31. Logical Replication">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="logical-replication.html" title="Chapter 31. Logical Replication">Up</a></td><th width="60%" align="center">Chapter 31. Logical Replication</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 14.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="logical-replication-subscription.html" title="31.2. Subscription">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="LOGICAL-REPLICATION-PUBLICATION"><div class="titlepage"><div><div><h2 class="title" style="clear: both">31.1. Publication</h2></div></div></div><p>
+ A <em class="firstterm">publication</em> can be defined on any physical
+ replication primary. The node where a publication is defined is referred to
+ as <em class="firstterm">publisher</em>. A publication is a set of changes
+ generated from a table or a group of tables, and might also be described as
+ a change set or replication set. Each publication exists in only one database.
+ </p><p>
+ Publications are different from schemas and do not affect how the table is
+ accessed. Each table can be added to multiple publications if needed.
+ Publications may currently only contain tables. Objects must be added
+ explicitly, except when a publication is created for <code class="literal">ALL
+ TABLES</code>.
+ </p><p>
+ Publications can choose to limit the changes they produce to
+ any combination of <code class="command">INSERT</code>, <code class="command">UPDATE</code>,
+ <code class="command">DELETE</code>, and <code class="command">TRUNCATE</code>, similar to how triggers are fired by
+ particular event types. By default, all operation types are replicated.
+ </p><p>
+ A published table must have a <span class="quote">“<span class="quote">replica identity</span>”</span> configured in
+ order to be able to replicate <code class="command">UPDATE</code>
+ and <code class="command">DELETE</code> operations, so that appropriate rows to
+ update or delete can be identified on the subscriber side. By default,
+ this is the primary key, if there is one. Another unique index (with
+ certain additional requirements) can also be set to be the replica
+ identity. If the table does not have any suitable key, then it can be set
+ to replica identity <span class="quote">“<span class="quote">full</span>”</span>, which means the entire row becomes
+ the key. This, however, is very inefficient and should only be used as a
+ fallback if no other solution is possible. If a replica identity other
+ than <span class="quote">“<span class="quote">full</span>”</span> is set on the publisher side, a replica identity
+ comprising the same or fewer columns must also be set on the subscriber
+ side. See <a class="xref" href="sql-altertable.html#SQL-ALTERTABLE-REPLICA-IDENTITY"><code class="literal">REPLICA IDENTITY</code></a> for details on
+ how to set the replica identity. If a table without a replica identity is
+ added to a publication that replicates <code class="command">UPDATE</code>
+ or <code class="command">DELETE</code> operations then
+ subsequent <code class="command">UPDATE</code> or <code class="command">DELETE</code>
+ operations will cause an error on the publisher. <code class="command">INSERT</code>
+ operations can proceed regardless of any replica identity.
+ </p><p>
+ Every publication can have multiple subscribers.
+ </p><p>
+ A publication is created using the <a class="link" href="sql-createpublication.html" title="CREATE PUBLICATION"><code class="command">CREATE PUBLICATION</code></a>
+ command and may later be altered or dropped using corresponding commands.
+ </p><p>
+ The individual tables can be added and removed dynamically using
+ <a class="link" href="sql-alterpublication.html" title="ALTER PUBLICATION"><code class="command">ALTER PUBLICATION</code></a>. Both the <code class="literal">ADD
+ TABLE</code> and <code class="literal">DROP TABLE</code> operations are
+ transactional; so the table will start or stop replicating at the correct
+ snapshot once the transaction has committed.
+ </p></div><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navfooter"><hr></hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="logical-replication.html" title="Chapter 31. Logical Replication">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="logical-replication.html" title="Chapter 31. Logical Replication">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="logical-replication-subscription.html" title="31.2. Subscription">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 31. Logical Replication </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 14.5 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 31.2. Subscription</td></tr></table></div></body></html> \ No newline at end of file