<?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>49.8. Synchronous Replication Support for Logical Decoding</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="logicaldecoding-writer.html" title="49.7. Logical Decoding Output Writers" /><link rel="next" href="replication-origins.html" title="Chapter 50. Replication Progress Tracking" /></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">49.8. Synchronous Replication Support for Logical Decoding</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="logicaldecoding-writer.html" title="49.7. Logical Decoding Output Writers">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="logicaldecoding.html" title="Chapter 49. Logical Decoding">Up</a></td><th width="60%" align="center">Chapter 49. Logical Decoding</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 11.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="replication-origins.html" title="Chapter 50. Replication Progress Tracking">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="LOGICALDECODING-SYNCHRONOUS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">49.8. Synchronous Replication Support for Logical Decoding</h2></div></div></div><p>
Logical decoding can be used to build
<a class="link" href="warm-standby.html#SYNCHRONOUS-REPLICATION" title="26.2.8. Synchronous Replication">synchronous
replication</a> solutions with the same user interface as synchronous
replication for <a class="link" href="warm-standby.html#STREAMING-REPLICATION" title="26.2.5. Streaming Replication">streaming
replication</a>. To do this, the streaming replication interface
(see <a class="xref" href="logicaldecoding-walsender.html" title="49.3. Streaming Replication Protocol Interface">Section 49.3</a>) must be used to stream out
data. Clients have to send <code class="literal">Standby status update (F)</code>
(see <a class="xref" href="protocol-replication.html" title="53.4. Streaming Replication Protocol">Section 53.4</a>) messages, just like streaming
replication clients do.
</p><div class="note"><h3 class="title">Note</h3><p>
A synchronous replica receiving changes via logical decoding will work in
the scope of a single database. Since, in contrast to
that, <em class="parameter"><code>synchronous_standby_names</code></em> currently is
server wide, this means this technique will not work properly if more
than one database is actively used.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="logicaldecoding-writer.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="logicaldecoding.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="replication-origins.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">49.7. Logical Decoding Output Writers </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 50. Replication Progress Tracking</td></tr></table></div></body></html>
