From: | "Scott Marlowe" <scott(dot)marlowe(at)gmail(dot)com> |
---|---|
To: | "Sim Zacks" <sim(at)compulab(dot)co(dot)il> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: 8.2.4 serious slowdown |
Date: | 2008-01-10 19:08:57 |
Message-ID: | dcc563d10801101108t4c92fa4aq869cc2b2f08041cd@mail.gmail.com |
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Lists: | pgsql-general pgsql-hackers |
On Jan 10, 2008 12:33 PM, Sim Zacks <sim(at)compulab(dot)co(dot)il> wrote:
> > Perhaps a suboptimal plan is picked due to configuration issues, e.g.
> > memory constraints? Could you post your postgresql.conf as well?
>
> Below is the postgresql.conf file for 8.2.4. The server has 2 GB of RAM and it was not maxed out when I ran the query.
> As I mentioned, I tried running both 8.0.11 and 8.2.4 on the same hardware, so that I would see if it was a difference in the hardware or the database.
>
> # -----------------------------
> # PostgreSQL configuration file
> # -----------------------------
> shared_buffers = 24MB# min 128kB or max_connections*16kB
That's really low. Try setting it to something a bit more aggressive,
say 100MB to 500MB. On a machine with 2 Gig ram, that's a pretty
reasonable range.
> #work_mem = 1MB# min 64kB
Try setting this a little higher, say 16 to 32 Megs.
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