Tom Lane wrote:
"Joshua D. Drake" <[EMAIL PROTECTED]> writes:
Why are you running a vacuum every 45 seconds? Increase your fsm_pages and run it every hour.
If I understood his description correctly, he's turning over 10% of a 500-row table every minute. So waiting an hour would mean 3000 dead rows in a 500-live-row table, which seems excessive. I'd agree with running a vacuum on this specific table every five minutes or so.
Given that he is doing more than enough vacuums, I think that the problem is probably not table bloat, but index bloat (ie, from a constantly shifting range of live index keys, which pre-7.4 btrees didn't handle well at all). This is just speculation though, without proof as yet.
Another information to know is if there are connection in the "unfamous" state: "Idle in transaction".
Is usefull if the OP show us the vacuum verbose output.
Regards Gaetano Mendola
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