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Multiple indexes stored the string portion of a polymorphic association when that was not actually needed. Indexes being larger or more present than they need to be has negative effects on the performance of the database server and queries against it. These indexes were additionally on some of the largest and most-populated collections in the database. Restructuring the indexes reduces the following issues: 1. Bloating of the indexes to such as size as they could not easily fit in memory 2. Frequent index ejection from memory, causing much slower query times Further work on index reduction - such as reduction of compound indexes which already have a full prefix index provided - should be performed, but this change should deal with the worst offenders.
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Multiple indexes stored the string portion of a polymorphic association when that was not actually needed. Indexes being larger or more present than they need to be has negative effects on the performance of the database server and queries against it. These indexes were additionally on some of the largest and most-populated collections in the database.
Restructuring the indexes reduces the following issues:
Further work on index reduction - such as reduction of compound indexes which already have a full prefix index provided - should be performed, but this change should deal with the worst offenders.
After deployment of this code, indexes will need a full rebuild.
Ticket - CU-868gbvfa4