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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>29.2. Disk Full Failure</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="disk-usage.html" title="29.1. Determining Disk Usage" /><link rel="next" href="wal.html" title="Chapter 30. Reliability and the Write-Ahead Log" /></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">29.2. Disk Full Failure</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="disk-usage.html" title="29.1. Determining Disk Usage">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="diskusage.html" title="Chapter 29. Monitoring Disk Usage">Up</a></td><th width="60%" align="center">Chapter 29. Monitoring Disk Usage</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="wal.html" title="Chapter 30. Reliability and the Write-Ahead Log">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="DISK-FULL"><div class="titlepage"><div><div><h2 class="title" style="clear: both">29.2. Disk Full Failure</h2></div></div></div><p>
The most important disk monitoring task of a database administrator
is to make sure the disk doesn't become full. A filled data disk will
not result in data corruption, but it might prevent useful activity
from occurring. If the disk holding the WAL files grows full, database
server panic and consequent shutdown might occur.
</p><p>
If you cannot free up additional space on the disk by deleting
other things, you can move some of the database files to other file
systems by making use of tablespaces. See <a class="xref" href="manage-ag-tablespaces.html" title="22.6. Tablespaces">Section 22.6</a> for more information about that.
</p><div class="tip"><h3 class="title">Tip</h3><p>
Some file systems perform badly when they are almost full, so do
not wait until the disk is completely full to take action.
</p></div><p>
If your system supports per-user disk quotas, then the database
will naturally be subject to whatever quota is placed on the user
the server runs as. Exceeding the quota will have the same bad
effects as running out of disk space entirely.
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