Csaba Nagy wrote:
Alternatively, perhaps a threshold so that a table is only considered
for vacuum if:
(table-size * overall-activity-in-last-hour) < threshold
Ideally you'd define your units appropriately so that you could just
define threshold in postgresql.conf as 30% (of peak activity in last 100
hours say).
No, this is definitely not enough. The problem scenario is when
autovacuum starts vacuuming a huge table and that keeps it busy 10 hours
and in the meantime the small but frequently updated tables get awfully
bloated...
Ah (lightbulb goes on)! I see what you mean now.
--
Richard Huxton
Archonet Ltd
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TIP 6: explain analyze is your friend
