From: | Andrew Sullivan <andrew(at)libertyrms(dot)info> |
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To: | pgsql-performance(at)postgresql(dot)org |
Subject: | Re: reindex/vacuum locking/performance? |
Date: | 2003-10-04 15:22:41 |
Message-ID: | 20031004152241.GL580@libertyrms.info |
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Lists: | pgsql-performance |
On Sat, Oct 04, 2003 at 12:29:55AM +0100, Matt Clark wrote:
> My real world experience on a *very* heavily updated OLTP type DB, following
> advice from this list (thanks guys!), is that there is essentially zero cost
> to going ahead and vacuuming as often as you feel like it. Go crazy, and
> speed up your DB!
That's not quite true. If vacuums start running into each other, you
can very easily start eating up all your I/O bandwidth. Even if you
gots lots of it.
Also, a vacuum pretty much destroys your shared buffers, so you have
to be aware of that trade-off too. Vacuum is not free. It's _way_
cheaper than it used to be, though.
A
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