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Re: function runs slow

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 (view raw or flat)
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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