Re: Auto Vacuum Daemon (again...)

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Matthew T(dot) O'Connor" <matthew(at)zeut(dot)net>
Cc: shridhar_daithankar(at)persistent(dot)co(dot)in,pgsql-hackers(at)postgresql(dot)org
Subject: Re: Auto Vacuum Daemon (again...)
Date: 2002-11-28 15:45:39
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"Matthew T. O'Connor" <matthew(at)zeut(dot)net> writes:
> interesting thought. I think this boils down to how many knobs do we
> need to put on this system. It might make sense to say allow upto X
> concurrent vacuums, a 4 processor system might handle 4 concurrent
> vacuums very well.

This is almost certainly a bad idea. vacuum is not very
processor-intensive, but it is disk-intensive. Multiple vacuums running
at once will suck more disk bandwidth than is appropriate for a
"background" operation, no matter how sexy your CPU is. I can't see
any reason to allow more than one auto-scheduled vacuum at a time.

regards, tom lane

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