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Check that all UserMerge hooked extensions actually have the proper indexes for UserMerge queries
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For example, today we discovered that image and flaggedrevs don't have indexes on the fields we use in our queries.

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Legoktm created this task.Jul 10 2015, 3:43 AM
Legoktm raised the priority of this task from to Needs Triage.
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Restricted Application added subscribers: Steinsplitter, Aklapper. · View Herald TranscriptJul 10 2015, 3:43 AM

Core tables:

  • image has index on img_user_text
  • filearchive has file_user_timestamp which uses fa_user_text
  • oldimage has oi_usertext_timestamp which uses oi_user_text
  • recentchanges has rc_user_text which uses rc_user_text
  • No index for ipblocks.ipb_by