Re: [HACKERS] Wrong index choosen?

From: "Matthew T(dot) O'Connor" <matthew(at)zeut(dot)net>
To: Gaetano Mendola <mendola(at)bigfoot(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Dennis Bjorklund <db(at)zigo(dot)dhs(dot)org>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: [HACKERS] Wrong index choosen?
Date: 2004-07-24 01:49:38
Message-ID: 4101C032.9060409@zeut.net
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-hackers pgsql-performance

Gaetano Mendola wrote:
> Well I think pg_autovacuum as is in 7.4 can not help me for this particular
> table.
>
> The table have 4.8 milions rows and I have for that table almost 10252 new
> entries for day.
>
> I'm using pg_autovacuum with -a 200 -A 0.8 this means a threashold for
> that table equal to: 3849008 and if I understod well the way pg_autovacuum
> works this means have an analyze each 375 days, and I need an analyze for
> each day, at least.
>
> So I think is better for me put an analyze for that table in the cron.
>
> Am I wrong ?

No, I think you are right. You could do something like -a 1000 -A
.00185, but that will probably for an analyze too often for most of your
other tables.

In response to

Browse pgsql-hackers by date

  From Date Subject
Next Message Barry S 2004-07-24 03:51:54 Re: PG 7.4.3 optimizer choosing sequential scan. Why?
Previous Message Gaetano Mendola 2004-07-24 00:07:27 Re: [HACKERS] Wrong index choosen?

Browse pgsql-performance by date

  From Date Subject
Next Message Ross J. Reedstrom 2004-07-26 04:57:10 arrays and indexes
Previous Message Gaetano Mendola 2004-07-24 00:07:27 Re: [HACKERS] Wrong index choosen?