Oracle-L: Solved - RE: UTL

From: Jamadagni, Rajendra <Rajendra.Jamadagni_at_espn.com>
Date: Mon, 27 Oct 2003 13:29:33 -0800
Message-ID: <F001.005D4B4B.20031027132933@fatcity.com>

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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Solved - RE: UTL_RAW and slowness