Robert Haas 53bb309d2d Teach autovacuum about multixact member wraparound. ... The logic introduced in commit b69bf30b9b and repaired in commits 669c7d20e6 and 7be47c56af helps to ensure that we don't overwrite old multixact member information while it is still needed, but a user who creates many large multixacts can still exhaust the member space (and thus start getting errors) while autovacuum stands idly by. To fix this, progressively ramp down the effective value (but not the actual contents) of autovacuum_multixact_freeze_max_age as member space utilization increases. This makes autovacuum more aggressive and also reduces the threshold for a manual VACUUM to perform a full-table scan. This patch leaves unsolved the problem of ensuring that emergency autovacuums are triggered even when autovacuum=off. We'll need to fix that via a separate patch. Thomas Munro and Robert Haas		2015-05-08 12:53:00 -04:00
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src	Teach autovacuum about multixact member wraparound.	2015-05-08 12:53:00 -04:00
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