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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>30.8. 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 V1.79.1" /><link rel="prev" href="logical-replication-security.html" title="30.7. Security" /><link rel="next" href="logical-replication-quick-setup.html" title="30.9. Quick Setup" /></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">30.8. Configuration Settings</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="logical-replication-security.html" title="30.7. Security">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="logical-replication.html" title="Chapter 30. Logical Replication">Up</a></td><th width="60%" align="center">Chapter 30. Logical Replication</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="logical-replication-quick-setup.html" title="30.9. Quick Setup">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="LOGICAL-REPLICATION-CONFIG"><div class="titlepage"><div><div><h2 class="title" style="clear: both">30.8. 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>
- The subscriber also requires the <code class="varname">max_replication_slots</code>
- to be set. In this case it should be set to at least the number of
- subscriptions that will be added to the subscriber.
- <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>.
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