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Re: database size growing continously

From: Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>
To: Peter Meszaros <pme(at)prolan(dot)hu>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: database size growing continously
Date: 2009-10-29 16:59:48
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
On Thu, Oct 29, 2009 at 8:44 AM, Peter Meszaros <pme(at)prolan(dot)hu> wrote:
> Hi All,
> I use postgresql 8.3.7 as a huge queue. There is a very simple table
> with six columns and two indices, and about 6 million records are
> written into it in every day continously commited every 10 seconds from
> 8 clients. The table stores approximately 120 million records, because a
> cron job daily deletes those ones are older than 20 day. Autovacuum is
> on and every settings is the factory default except some unrelated ones
> (listen address, authorization). But my database is growing,
> characteristically ~600MByte/day, but sometimes much slower (eg. 10MB,
> or even 0!!!).

Sounds like you're blowing out your free space map.  Things to try:

1: delete your rows in smaller batches.  Like every hour delete
everything over 20 days so you don't delete them all at once one time
a day.
2: crank up max fsm pages large enough to hold all the dead tuples.
3: lower the autovacuum cost delay
4: get faster hard drives so that vacuum can keep up without causing
your system to slow to a crawl while vacuum is running.

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Subject: Modeling a table with arbitrary columns
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