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<h2>Maintenance</h2>
<p>To optimize page generation time, Piwigo uses cached
information. For example, instead of counting the number of pictures
contained in each category at each page reload, this information is stored
in the database. In theory, this information should always be correct, but
sometimes an error can occur and cached information becomes wrong.</p>
<p>Some information become useless with time going by. Deleting this useless
information from database make you save disk space.</p>
<ul>
<li><strong>Update categories informations:</strong> For each category,
the following information is checked, and updated if necessary : list of parent
categories, number of pictures, last picture date, position among
brother categories, position among all categories. This action also checks
the representative picture consistency.</li>
<li><strong>Update images information:</strong> For each picture,
information updated is : full path to file, average
rate. <em>Warning</em>, do not mix up: metadata information
must be synchronized from <span class="pwgScreen">Administration,
Categories, Synchronize</span>, or on the modification screen of a
single picture (through <span class="pwgScreen">Picture</span> for
example).</li>
<li><strong>Repair and optimize the database:</strong>
Perform re-order, repair and optimize operations on each table of the database.
</li>
</ul>
<ul>
<li><strong>Purge history details:</strong> Delete all lines from the
<code>history</code> table. Screen <span class="pwgScreen">Administration,
Specials, History</span> will not longer show information for the past
history. <em>Warning</em>: all data will be lost, without any way to
get them back.</li>
<li><strong>Purge history summary:</strong> Delete all the summary information about visit history. This summary is calculated from the history details.</li>
<li><strong>Purge sessions:</strong> Delete expired user sessions.</li>
<li><strong>Purge never used notification feeds</strong></li>
<li><strong>Purge searches history</strong></li>
<li><strong>Purge compiled templates</strong></li>
</ul>
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