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-<h2>Maintenance</h2>
-
-<p>To optimize page generation time, PhpWebGallery 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 informations become useless with time. Deleting this useless
-information from database make you save disk space.</p>
-
-<ul>
-
- <li><strong>Update categories informations:</strong> For each category,
- informations to update or control are the following : list of parent
- categories, number of pictures, date of the last picture, position among
- brother categories, position among all categories. This action also checks
- the coherence of representative picture.</li>
-
- <li><strong>Update images informations:</strong> For each picture,
- informations to update are : full path to file, average
- rate. <em>Warning</em>: do not get confuse with metadata informations
- which can be synchronized from <span class="pwgScreen">Administration,
- Categories, Synchronize</span> or by reaching the modification screen of a
- single picture (through <span class="pwgScreen">Picture</span> for
- example).</li>
-
- <li><strong>Repair and optimize database:</strong>
- For each table, re-odrer, repair and optimize operations are done.
- </li>
-</ul>
-
-<ul>
- <li><strong>Purge history detail:</strong> Delete all lines from
- <code>history</code> table. Screen <span class="pwgScreen">Administration,
- Specials, History</span> shows no informations anymore on past
- history. <em>Warning</em>: all data will be lost and there is no way to
- get informations back.</li>
-
- <li><strong>Purge history summary:</strong> Delete all the summary information about visit history. This summary is calculated from the history detail.</li>
-
- <li><strong>Purge sessions:</strong> Delete expired user sessions.</li>
-
- <li><strong>Purge never used notification feeds</strong></li>
-
-</ul>