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Add the "recheck" logic to autovacuum worker code. The worker first builds
its table list and then rechecks pgstat before vacuuming each table toverify that no one has vacuumed the table in the meantime.In the current autovacuum world this only means that a worker will notvacuum a table that a user has vacuumed manually after the worker started.When support for multiple autovacuum workers is introduced, this will reducethe probability of simultaneous workers on the same database doing redundantwork.1 parent685badd commit7d4c9a5
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