Hello, hackers. Yesterday I have noticed that in simple protocol mode snapshot is taken twice - first time for parsing/analyze and later for execution. I was thinking it is a great idea to reuse the same snapshot. After some time (not short) I was able to find this thread from 2011 with exactly same idea (of course after I already got few % of performance in POC): https://www.postgresql.org/message-id/flat/CA%2BTgmoYqKRj9BozjB-%2BtLQgVkSvzPFWBEzRF4PM2xjPOsmFRdw%40mail.gmail.com And it was even merged: "Take fewer snapshots" ( https://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=d573e239f03506920938bf0be56c868d9c3416da ) But where is optimisation in the HEAD? It absent because was reverted later in 2012 because of tricky reasons ( https://www.postgresql.org/message-id/flat/5075D8DF.6050500%40fuzzy.cz ) in commit "Revert patch for taking fewer snapshots." ( https://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=532994299e2ff208a58376134fab75f5ae471e41 ) I think it is good idea to add few comments to code related to the topic in order to safe time for a next guy. Comments-only patch attached. Thanks, Michail.
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