| Server IP : 104.21.25.180 / Your IP : 162.159.115.42 Web Server : Apache/2.4.37 System : Linux almalinux.duckdns.org 4.18.0-553.111.1.el8_10.x86_64 #1 SMP Sun Mar 8 20:06:07 EDT 2026 x86_64 User : ricodeal ( 1046) PHP Version : 7.4.33 Disable Function : NONE MySQL : OFF | cURL : ON | WGET : ON | Perl : ON | Python : ON | Sudo : ON | Pkexec : ON Directory : /usr/share/doc/postgresql-docs/html/ |
Upload File : |
<?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>F.41. test_decoding</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="[email protected]" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="tcn.html" title="F.40. tcn" /><link rel="next" href="tsm-system-rows.html" title="F.42. tsm_system_rows" /></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">F.41. test_decoding</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="tcn.html" title="F.40. tcn">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="contrib.html" title="Appendix F. Additional Supplied Modules">Up</a></td><th width="60%" align="center">Appendix F. Additional Supplied Modules</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 10.23 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="tsm-system-rows.html" title="F.42. tsm_system_rows">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="TEST-DECODING"><div class="titlepage"><div><div><h2 class="title" style="clear: both">F.41. test_decoding</h2></div></div></div><a id="id-1.11.7.50.2" class="indexterm"></a><p> <code class="filename">test_decoding</code> is an example of a logical decoding
output plugin. It doesn't do anything especially useful, but can serve as
a starting point for developing your own output plugin.
</p><p> <code class="filename">test_decoding</code> receives WAL through the logical decoding
mechanism and decodes it into text representations of the operations
performed.
</p><p> Typical output from this plugin, used over the SQL logical decoding
interface, might be:
</p><pre class="programlisting">postgres=# SELECT * FROM pg_logical_slot_get_changes('test_slot', NULL, NULL, 'include-xids', '0');
lsn | xid | data
-----------+-----+--------------------------------------------------
0/16D30F8 | 691 | BEGIN
0/16D32A0 | 691 | table public.data: INSERT: id[int4]:2 data[text]:'arg'
0/16D32A0 | 691 | table public.data: INSERT: id[int4]:3 data[text]:'demo'
0/16D32A0 | 691 | COMMIT
0/16D32D8 | 692 | BEGIN
0/16D3398 | 692 | table public.data: DELETE: id[int4]:2
0/16D3398 | 692 | table public.data: DELETE: id[int4]:3
0/16D3398 | 692 | COMMIT
(8 rows)</pre><p>
</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="tcn.html" title="F.40. tcn">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="contrib.html" title="Appendix F. Additional Supplied Modules">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="tsm-system-rows.html" title="F.42. tsm_system_rows">Next</a></td></tr><tr><td width="40%" align="left" valign="top">F.40. tcn </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 10.23 Documentation">Home</a></td><td width="40%" align="right" valign="top"> F.42. tsm_system_rows</td></tr></table></div></body></html>