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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>31.10. Configuration Settings</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-security.html" title="31.9. Security" /><link rel="next" href="logical-replication-quick-setup.html" title="31.11. Quick Setup" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">31.10. Configuration Settings</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="logical-replication-security.html" title="31.9. Security">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 15.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="logical-replication-quick-setup.html" title="31.11. Quick Setup">Next</a></td></tr></table><hr /></div><div class="sect1" id="LOGICAL-REPLICATION-CONFIG"><div class="titlepage"><div><div><h2 class="title" style="clear: both">31.10. Configuration Settings</h2></div></div></div><p>
Logical replication requires several configuration options to be set.
</p><p>
On the publisher side, <code class="varname">wal_level</code> must be set to
<code class="literal">logical</code>, and <code class="varname">max_replication_slots</code>
must be set to at least the number of subscriptions expected to connect,
plus some reserve for table synchronization. And
<code class="varname">max_wal_senders</code> should be set to at least the same as
<code class="varname">max_replication_slots</code> plus the number of physical
replicas that are connected at the same time.
</p><p>
<code class="varname">max_replication_slots</code> must also be set on the subscriber.
It should be set to at least the number of subscriptions that will be added
to the subscriber, plus some reserve for table synchronization.
<code class="varname">max_logical_replication_workers</code> must be set to at least
the number of subscriptions, again plus some reserve for the table
synchronization. Additionally the <code class="varname">max_worker_processes</code>
may need to be adjusted to accommodate for replication workers, at least
(<code class="varname">max_logical_replication_workers</code>
+ <code class="literal">1</code>). Note that some extensions and parallel queries
also take worker slots from <code class="varname">max_worker_processes</code>.
</p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="logical-replication-security.html" title="31.9. Security">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-quick-setup.html" title="31.11. Quick Setup">Next</a></td></tr><tr><td width="40%" align="left" valign="top">31.9. Security </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 31.11. Quick Setup</td></tr></table></div></body></html>
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