| From: | Bill Moran <wmoran(at)potentialtech(dot)com> |
|---|---|
| To: | pginfo <pginfo(at)t1(dot)unisoftbg(dot)com> |
| Cc: | "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: slow vacuum performance |
| Date: | 2004-03-24 14:07:27 |
| Message-ID: | 4061961F.6080009@potentialtech.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
pginfo wrote:
> Hi,
>
> I am running pg 7.4.1 on linux box.
> I have a midle size DB with many updates and after it I try to run
> vacuum full analyze.
> It takes about 2 h.
> If I try to dump and reload the DB it take 20 min.
>
> How can I improve the vacuum full analyze time?
How often are you vacuuming? If you've gone a LONG time since the last vacuum,
it can take quite a while, to the point where a dump/restore is faster.
A recent realization that I've had some misconceptions about vacuuming led me
to re-read section 8.2 of the admin guide (on vacuuming) ... I highly suggest
a review of these 3 pages of the admin manual, as it contains an excellent
description of why databases need vacuumed, that one can use to determine how
often vacuuming is necessary.
--
Bill Moran
Potential Technologies
http://www.potentialtech.com
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