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When resetting a sequence number, we call change_database_structure() which in turns clears the MUC cache for databasemeta. This cache contains information about the table, columns, etc. After the cache is cleared, it must be re-filled, and it was discovered that the get_columns() code which fills this cache can take a particularly long time. Given that this is called for every table in Moodle, this can add up to a significant period, and this is done on a per-testsuite basis. On my SSD install this was taking approximately 40 seconds on each re-fill of the cache. |
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