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Re: Query is slow when executing in procedure

From: "ramasubramanian" <ramasubramanian(dot)g(at)renaissance-it(dot)com>
To: "A(dot) Kretschmer" <andreas(dot)kretschmer(at)schollglas(dot)com>,<pgsql-performance(at)postgresql(dot)org>
Subject: Re: Query is slow when executing in procedure
Date: 2009-11-24 06:29:48
Message-ID: 9E9E7D023A1E447FB303355E1C98B9B0@ramasubramanian (view raw or flat)
Thread:
Lists: pgsql-performance
Thanks a lot Kretschmer. i will try it .

Regards,
Ram

----- Original Message ----- 
From: "A. Kretschmer" <andreas(dot)kretschmer(at)schollglas(dot)com>
To: <pgsql-performance(at)postgresql(dot)org>
Sent: Tuesday, November 24, 2009 11:45 AM
Subject: Re: [PERFORM] Query is slow when executing in procedure


> In response to ramasubramanian :
>> Dear all,
>>     The query is slow when executing in the stored procedure(it is taking
>> around 1 minute). when executing as a sql it is taking 4 seconds.
>> basically i am selecting the varchar column which contain 4000 character. 
>> We
>> have as iindex on the table. We have analyzed the table also. What could 
>> be the
>> reason. How to improve it?
>
> The reason is hard to guess, because you don't provide enough
> informations like the function code.
>
> My guess:
>
> You calls the function with a parameter, and the planner isn't able to
> chose a fast plan because he doesn't know the parameter. That's why he
> is choosen a seq-scan. You can rewrite your function to using dynamical
> execute a string that contains your sql to force the planner search an
> optimal plan for your actual parameter.
>
> But yes, that's only a wild guess (and sorry about my english...)
>
> Please, show us the table and the function-code.
>
>
> Regards, Andreas
> -- 
> Andreas Kretschmer
> Kontakt:  Heynitz: 035242/47150,   D1: 0160/7141639 (mehr: -> Header)
> GnuPG: 0x31720C99, 1006 CCB4 A326 1D42 6431  2EB0 389D 1DC2 3172 0C99
>
> -- 
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> 



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