install-next-nightly-vacuum.adp
Delivered as text/html
Related Files
[ hide source ] | [ make this the default ]
File Contents
<property name="context">{/doc/acs-core-docs/ {ACS Core Documentation}} {Vacuum Postgres nightly}</property> <property name="doc(title)">Vacuum Postgres nightly</property> <master> <style> div.sect2 > div.itemizedlist > ul.itemizedlist > li.listitem {margin-top: 16px;} div.sect3 > div.itemizedlist > ul.itemizedlist > li.listitem {margin-top: 6px;} </style> <include src="/packages/acs-core-docs/lib/navheader" leftLink="install-openacs-delete-tablespace" leftLabel="Prev" title="Chapter 7. Database Management" rightLink="backup-recovery" rightLabel="Next"> <div class="sect1"> <div class="titlepage"><div><div><h2 class="title" style="clear: both"> <a name="install-next-nightly-vacuum" id="install-next-nightly-vacuum"></a>Vacuum Postgres nightly</h2></div></div></div><p>The "vacuum" command must be run periodically to reclaim space in versions of PostgreSQL before 7.4. The "vacuum analyze" form additionally collects statistics on the disbursion of columns in the database, which the optimizer uses when it calculates just how to execute queries. The availability of this data can make a tremendous difference in the execution speed of queries. This command can also be run from cron, but it probably makes more sense to run this command as part of your nightly backup procedure - if "vacuum" is going to screw up the database, you'd prefer it to happen immediately after (not before!) you've made a backup! The "vacuum" command is very reliable, but conservatism is the key to good system management. So, if you're using the export procedure described above, you don't need to do this extra step.</p><p>Edit your crontab:</p><pre class="programlisting">[joeuser ~]$ <strong class="userinput"><code>crontab -e</code></strong> </pre><p>We'll set vacuum up to run nightly at 1 AM. Add the following line:</p><pre class="programlisting"> 0 1 * * * /usr/local/pgsql/bin/vacuumdb <span class="replaceable"><span class="replaceable">$OPENACS_SERVICE_NAME</span></span> </pre><div class="cvstag">($‌Id: database-maintenance.xml,v 1.9 2017/08/07 23:47:54 gustafn Exp $)</div> </div> <include src="/packages/acs-core-docs/lib/navfooter" leftLink="install-openacs-delete-tablespace" leftLabel="Prev" leftTitle="Deleting a tablespace" rightLink="backup-recovery" rightLabel="Next" rightTitle="Chapter 8. Backup and Recovery" homeLink="index" homeLabel="Home" upLink="database-management" upLabel="Up">