| From: | Mladen Gogala <mladen(dot)gogala(at)vmsinfo(dot)com> |
|---|---|
| To: | "A(dot) Kretschmer" <andreas(dot)kretschmer(at)schollglas(dot)com> |
| Cc: | "pgsql-novice(at)postgresql(dot)org" <pgsql-novice(at)postgresql(dot)org> |
| Subject: | Re: function runs slow |
| Date: | 2010-07-16 00:26:49 |
| Message-ID: | 4C3FA749.5010803@vmsinfo.com |
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| Thread: | |
| Lists: | pgsql-novice |
A. Kretschmer wrote:
> In response to Charles Holleran :
>
>> Why is it slow when the same un-functionized query was fast? The tbl_a has
>> est. 30,000,000 records. It has an index for (x,y) pairs. It has an index for
>> date_observed. So good results on the straight query. Where did I go wrong
>> with the function?
>>
>
> The planner isn't able to choose the right plan because he don't know
> the actual parameters.
>
That is precisely why I asked about the values for the bind variables.
Unfortunately, there is no facility that could influence the plan in
this case. Constant re-parsing will, of course, be grossly suboptimal.
--
Mladen Gogala
Sr. Oracle DBA
1500 Broadway
New York, NY 10036
(212) 329-5251
www.vmsinfo.com
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