Really, as far as autovacuum is concerned, it would be much more useful
to be able to reliably detect that a table has been recently vacuumed,
without having to request a 10ms-recent pgstat snapshot. That would
greatly reduce the amount of time autovac spends on pgstat requests.
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Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services