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Re: Memory usage on subselect

From: Gaetano Mendola <mendola(at)bigfoot(dot)com>
To: Dan Field <dof(at)llgc(dot)org(dot)uk>
Subject: Re: Memory usage on subselect
Date: 2004-05-26 16:29:42
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Lists: pgsql-sql
Dan Field wrote:

> On 24 May 2004, at 14:37, Tom Lane wrote:
>> Dan Field <dof(at)llgc(dot)org(dot)uk> writes:
>>> I have a similar problem with just one of my queries (although it isn't
>>> a sub select):
>> You really ought to vacuum and/or analyze occasionally.  The EXPLAIN
>> results show that the planner hasn't got any non-default statistics
>> for any of these tables.
> Wow, thanks for that. I'd been pulling my hair out for a couple of days 
> wondering where I was going wrong.
> I went from 45 second queries down to sub second query lengths  after a 
> simple vacuum full analyze.
> I've now added nightly and monthly cron jobs to do this for me in future.
> Out of curiosity, why is this deemed a DBA task rather than an automated 
> postgres task?
> Once again, many thanks.

You have to use the pg_autovacuum demon.

Run the vacuum full and the reindex once in a week.

Gaetano Mendola

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