From: | Andy Colson <andy(at)squeakycode(dot)net> |
---|---|
To: | Derrick Rice <derrick(dot)rice(at)gmail(dot)com> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: Tracking table modifications / table stats |
Date: | 2011-03-03 17:34:08 |
Message-ID: | 4D6FD110.1010105@squeakycode.net |
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Thread: | |
Lists: | pgsql-general |
On 3/3/2011 11:00 AM, Derrick Rice wrote:
> Hey folks,
>
> I was looking through the contrib modules with 8.4 and hoping to find
> something that satisfies my itch.
> http://www.postgresql.org/docs/8.4/static/pgstatstatements.html comes
> the closest.
>
> I'm inheriting a database which has mostly unknown usage patterns, and
> would like to figure them out so that I can allocate tablespaces and set
> autovacuum settings appropriately. To do this, it seems I need to know
> (at least) the number of rows read, rows updated, rows deleted, and rows
> inserted for each table (over time, or until reset).
>
> I suppose things like disk usage and CPU usage would be interesting as
> well, but I'm somewhat less concerned with those. For one, CPU usage
> can't be tied to a table as easily and is more about query optimization
> than PostgreSQL configuration (excluding cost coefficients and memory
> size settings). For the other, disk usage can be mostly inferred from
> the row size and and number of operations per table (this does exclude
> seq. scans and heavy heavy index use, though). I realize those
> statements are fuzzy and short-sighted, but I'm trying to get "good
> enough" information, not optimize a space shuttle.
>
> There's no way I'm the first person to feel the need for this. Is there
> a doc or wiki which gives some recommendations? I'd like to avoid
> parsing logs or installing triggers. I'd also like to avoid heavy
> statement-level tracking like the above mentioned contrib does (sounds
> expensive, and I'm not sure the users have parameterized SQL).
>
> Thanks,
>
> Derrick
There are stat tables you can look at:
http://www.postgresql.org/docs/9.0/static/monitoring-stats.html
-Andy
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