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Manual:updateCollation.php

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This script updates category collations. You need to run this script after $wgCategoryCollation has been changed. It is also needed to be run after upgrading to 1.17 and later from a version of MediaWiki before 1.17. Normally it is run as part of update.php.

If your category collations are messed up (aka things sort incorrectly in categories), you can use the --force switch to forcibly fix all the category collations. See php updateCollation.php --help for a list of all options.

The run time of the script depends on the number of rows in the Manual:categorylinks table , and for extremely large wikis may take over 24 hours. (A run on the English Wikipedia in September 2016 took around a week: phab:T136150.) The script can process on the order of 10,000 rows per minute (depending on your setup); you can view the estimated number of rows on your wiki before running the real script by using updateCollation.php --dry-run. Wikimedia wikis of various sizes have been painlessly switched to different collations over time (phab:T47443), just make sure to estimate how long the script will run before you start it.

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