| 1 | <h2>Maintenance</h2> |
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| 2 | |
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| 3 | <p>To optimize page generation time, Piwigo uses cached |
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| 4 | information. For example, instead of counting the number of pictures |
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| 5 | contained in each category at each page reload, this information is stored |
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| 6 | in the database. In theory, this information should always be correct, but |
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| 7 | sometimes an error can occur and cached information becomes wrong.</p> |
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| 8 | |
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| 9 | <p>Some informations become useless with time. Deleting this useless |
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| 10 | information from database make you save disk space.</p> |
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| 11 | |
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| 12 | <ul> |
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| 13 | |
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| 14 | <li><strong>Update categories informations:</strong> For each category, |
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| 15 | informations to update or control are the following : list of parent |
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| 16 | categories, number of pictures, date of the last picture, position among |
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| 17 | brother categories, position among all categories. This action also checks |
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| 18 | the coherence of representative picture.</li> |
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| 19 | |
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| 20 | <li><strong>Update images informations:</strong> For each picture, |
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| 21 | informations to update are : full path to file, average |
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| 22 | rate. <em>Warning</em>: do not get confuse with metadata informations |
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| 23 | which can be synchronized from <span class="pwgScreen">Administration, |
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| 24 | Categories, Synchronize</span> or by reaching the modification screen of a |
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| 25 | single picture (through <span class="pwgScreen">Picture</span> for |
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| 26 | example).</li> |
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| 27 | |
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| 28 | <li><strong>Repair and optimize database:</strong> |
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| 29 | For each table, re-odrer, repair and optimize operations are done. |
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| 30 | </li> |
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| 31 | </ul> |
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| 32 | |
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| 33 | <ul> |
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| 34 | <li><strong>Purge history detail:</strong> Delete all lines from |
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| 35 | <code>history</code> table. Screen <span class="pwgScreen">Administration, |
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| 36 | Specials, History</span> shows no informations anymore on past |
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| 37 | history. <em>Warning</em>: all data will be lost and there is no way to |
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| 38 | get informations back.</li> |
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| 39 | |
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| 40 | <li><strong>Purge history summary:</strong> Delete all the summary information about visit history. This summary is calculated from the history detail.</li> |
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| 41 | |
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| 42 | <li><strong>Purge sessions:</strong> Delete expired user sessions.</li> |
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| 43 | |
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| 44 | <li><strong>Purge never used notification feeds</strong></li> |
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| 45 | |
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| 46 | </ul> |
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