Hi, I have written microvacuum support for gist access method. Briefly microvacuum includes two steps: 1. When search tells us that the tuple is invisible to all transactions it is marked LP_DEAD and page is marked as "has dead tuples", 2. Then, when insert touches full page which has dead tuples it calls microvacuum instead of splitting page. You can find a kind of review here [1].
[1] http://www.google-melange.com/gsoc/proposal/public/google/gsoc2015/ivanitskiy_ilya/5629499534213120 Patch is in attachements. Please review it. -- Best regards, Lubennikova Anastasia
microvacuum_for_gist.patch
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