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This part of the code is changing an index on the course_sections table to be unique, for this to happen in the upgrade script the index must be deleted and then the new version added. Before this change the following was being done: * The index is removed * A query to delete records that were not unique on this index is performed * The unique version of the index is added After this change the following happens: * A query to delete records that were not unique on this index is performed * The index is removed * The unique version of the index is added When the original index is present the query uses it, which greatly improves the execution plan. Before the change an upgrade on a site with around 387967 course_section records the upgrade would be stuck on the delete query for many hours, after the change the time can be measured in minutes.
QUICK INSTALL ============= For the impatient, here is a basic outline of the installation process, which normally takes me only a few minutes: 1) Move the Moodle files into your web directory. 2) Create a single database for Moodle to store all its tables in (or choose an existing database). 3) Visit your Moodle site with a browser, you should be taken to the install.php script, which will lead you through creating a config.php file and then setting up Moodle, creating an admin account etc. 4) Set up a cron task to call the file admin/cron.php every five minutes or so. For more information, see the INSTALL DOCUMENTATION: http://docs.moodle.org/en/Installing_Moodle Good luck and have fun! Martin Dougiamas, Lead Developer