Re: fetch calls

From: Antony Raj <ca_raj_at_yahoo.com>
Date: Fri, 3 Feb 2012 11:22:12 -0800 (PST)
Message-ID: <1328296932.69742.YahooMailNeo_at_web36801.mail.mud.yahoo.com>

This SQL is executed 36k times once for each emplid using bind variables.  
select .....FROM table FILL  where FLAG ='P' and EMPLID = :1 and EMPL_RCD = :2 and  DEPENDENT_BENEF  <> '00';

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From: Toon Koppelaars <toon.koppelaars_at_rulegen.com> To: ca_raj_at_yahoo.com
Cc: "oracle-l_at_freelists.org" <oracle-l_at_freelists.org> Sent: Friday, February 3, 2012 2:10 PM
Subject: Re: fetch calls

I don't see arraysize being the problem here.

• Your 'application' is submitting the SQL (btw. what is the sql-text?) 36K times.
• It is even parsing it 36K times.
• It fetches on average 1.3 rows per execution.
• For that it requires a bit over 10 block visits, which is not too bad at all.
• And it does all this in about 0.001 CPU second per execution.
• There is a lot of physical I/O going on...: which explains the huge difference between CPU and elapsed time.
• Might be worthwile to run this tracefile through Method-R's profiler, to see what skew is going on or not.

Your issue is it is executing the SQL 36k times...

On Fri, Feb 3, 2012 at 7:54 PM, Antony Raj <ca_raj_at_yahoo.com> wrote:

Hi All,
> 
>99% of the response time spent on the Fetch call.I know changing the arraysize from SQL*PLUS would reduce the number of fetch calls.
>But this sql is generated from a third-party application's application server on which the maximum fetch size configured as unlimited.
>Is there any other ways to reduce the number of fetch calls?
> 
> 
>Rows  Operation
>1  TABLE ACCESS BY INDEX ROWID ODSTEST (cr  pr=3 pw=0 time 036 us cost=9 size#5 card=1)
>1     INDEX RANGE SCAN ODSTESTIDX (cr  pr=3 pw=0 time 991 us cost=8 size=0 card=1) (object id 684849)
>Database Call Statistics
>Call  Count  Misses  CPU [s]  Elapsed [s]  PIO [b]  LIO [b]  Consistent [b]  Current [b]  Rows
>Parse  36,826  1  0.140  1.390  0  0  0  0  0
>Execute  36,826  1  2.130  10.326  0  2  2  0  0
>Fetch  36,826  0  42.890  802.626  123,585  390,806  390,806  0  43,918
>Total  110,478  2  45.160  814.342  123,585  390,808  390,808  0  43,918
>Average (per execution)  3  0  0.001  0.022  3  10  10  0  1
>Average (per row)  2  0  0.001  0.019  2  8  8  0  1
> 
>Thanks
>--
>http://www.freelists.org/webpage/oracle-l
>
>
>

-- 
Toon Koppelaars
RuleGen BV
Toon.Koppelaars_at_RuleGen.com
www.RuleGen.com
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(co)Author: "Applied Mathematics for Database Professionals"
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Received on Fri Feb 03 2012 - 13:22:12 CST