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Should be able to control time window for autovcuum? And how?

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I think so, yes.

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thinking of some external utility to turn autovacuum_enabled on/off.

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The importance of scheduling autovacuum to run at the right time is too great to be left to ad-hoc approaches like cron jobs, IMV

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Probably good to weigh many things. One systems has defaults that run ANALYZE-like process off (western) business hours. Simplistic?

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Yeah, I guess that would be good enough for most of business users in reality.