Oracle-L: Re: Solved - RE: UTL

From: Arup Nanda <orarup_at_hotmail.com>
Date: Mon, 27 Oct 2003 14:29:25 -0800
Message-ID: <F001.005D4B52.20031027142925@fatcity.com>

Awesome, Raj!

And thank you for sharing this with us.

Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Monday, October 27, 2003 4:29 PM

> Read if you are interested ...
>
> Finally I got some time and luckily the largest message to use with
dbms_profiler. And the results shocked me .... dbms_profiler showed me that instead of utl_raw, substr() was the culprit. Remember my operation is character by character.
>
> After some long thinking and evaluating different techniques, I finally
decided that the delay was due to the fact that substr() operation was way too slow to be included in my processing. As for alternatives, only thing I could think was parallel processing and pipelined came to my mind ...
>
> So, I implemented a pipelined function that does nothing, but takes a CLOB
and returns me 1K chunks (using dbms_lob.read()) of it. I do this operation in a cursor loop, so by the time I process 1k characters, next 1k is waiting at the doorstep. Thus by parallelising the delay, I finally resolved the problem.
>
> Thanks you all for your help, suggestion and hints which really got me
thinking. Plus having 9202 helped too otherwise it would have been difficult (without pipelined function).
> Raj
> --------------------------------------------------------------------------

> Rajendra dot Jamadagni at nospamespn dot com
> All Views expressed in this email are strictly personal.
> QOTD: Any clod can have facts, having an opinion is an art !
>
>

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> Author: Jamadagni, Rajendra
> INET: Rajendra.Jamadagni_at_espn.com
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-- 
Author: Arup Nanda
  INET: orarup_at_hotmail.com

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Received on Mon Oct 27 2003 - 16:29:25 CST

Re: Solved - RE: UTL_RAW and slowness