| From: | bricklen <bricklen(at)gmail(dot)com> |
|---|---|
| To: | "Scott Marlowe" <scott(dot)marlowe(at)gmail(dot)com> |
| Cc: | "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: slow query |
| Date: | 2009-01-12 23:40:27 |
| Message-ID: | 33b743250901121540p40c86e7fs9b6bea360cdeb90b@mail.gmail.com |
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| Lists: | pgsql-performance |
On Mon, Jan 12, 2009 at 2:59 PM, Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> wrote:
> OK, I've got a query that's running slow the first time, then fast.
> But I can't see where the time is really being spend on the first run.
> Query and plan attached to preserve formatting.
>
> The index scan and nested loop that feed the next layer up nested loop
> both show very short run times. Yet the nested loop they feed to
> takes 30 seconds to run. If I run the query a second time, everything
> looks the same but the second nested loop now runs in well under a
> second.
>
> I can't figure out where my time's going to.
If it is any help, there is a nice tool to format your explain plan at
http://explain.depesz.com
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