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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>77.3. Backup Manifest WAL Range Object</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="backup-manifest-files.html" title="77.2. Backup Manifest File Object" /><link rel="next" href="appendixes.html" title="Part VIII. Appendixes" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">77.3. Backup Manifest WAL Range Object</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="backup-manifest-files.html" title="77.2. Backup Manifest File Object">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="backup-manifest-format.html" title="Chapter 77. Backup Manifest Format">Up</a></td><th width="60%" align="center">Chapter 77. Backup Manifest Format</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 16.2 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="appendixes.html" title="Part VIII. Appendixes">Next</a></td></tr></table><hr /></div><div class="sect1" id="BACKUP-MANIFEST-WAL-RANGES"><div class="titlepage"><div><div><h2 class="title" style="clear: both">77.3. Backup Manifest WAL Range Object <a href="#BACKUP-MANIFEST-WAL-RANGES" class="id_link">#</a></h2></div></div></div><p>
The object which describes a WAL range always has three keys:
</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">Timeline</code></span></dt><dd><p>
The timeline for this range of WAL records, as an integer.
</p></dd><dt><span class="term"><code class="literal">Start-LSN</code></span></dt><dd><p>
The LSN at which replay must begin on the indicated timeline in order to
make use of this backup. The LSN is stored in the format normally used
by <span class="productname">PostgreSQL</span>; that is, it is a string
consisting of two strings of hexadecimal characters, each with a length
of between 1 and 8, separated by a slash.
</p></dd><dt><span class="term"><code class="literal">End-LSN</code></span></dt><dd><p>
The earliest LSN at which replay on the indicated timeline may end when
making use of this backup. This is stored in the same format as
<code class="literal">Start-LSN</code>.
</p></dd></dl></div><p>
Ordinarily, there will be only a single WAL range. However, if a backup is
taken from a standby which switches timelines during the backup due to an
upstream promotion, it is possible for multiple ranges to be present, each
with a different timeline. There will never be multiple WAL ranges present
for the same timeline.
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