Neill Magill 2fc2dfbb37 MDL-66253 calendar: New indexes to reduce full table scans
The eventtype index will stop full table scans when the Event API
retrieves events for a group or category and there are a large number
of groups or categories so it cannot use the groupid or categoryid
indexes efficiently.

The modulename-instance index will improve the performance of queries
used by activity backup, deletion and visibility changes where all
the events for an individual activity need to be found.
2020-01-14 08:47:32 +00:00
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