Re: Anyone seen weblogic do this?

From: Connor McDonald <hamcdc_at_yahoo.co.uk>
Date: Fri, 2 Jul 2004 14:54:26 +0100 (BST)
Message-ID: <20040702135427.96211.qmail@web25201.mail.ukl.yahoo.com>

Here's today bizarre relationship...

We created some single table aggregate fast refresh materialised views, but no matter how hard we tried to follow the rules as per the manuals, the darn things would not allow a fast refresh. Some tracing showed that things started to go wrong as the pre-processor did some select's from dual (retrieving the rowid from dual of all things.)

And our DUAL was a local IOT...So we converted dual back to its normal form and voila! our fast refreshes now worked. Now our DUAL is a heap with an index as well so we get the best of both worlds.

Cheers
Connor

• Tanel_Põder <tanel.poder.003_at_mail.ee> wrote: > If you cannot eliminate these excessive queries by any means, then you could
  > relieve the performance hit by having a local dual synonym pointing to a
  > view uner sys schema whish queries x$dual instead. That way you'd eliminate
  > 3 LIOs per query in 9i (in RAC environment you have to do a little extra
  > trick to query only your instance's row from x$dual).
  >
  

  ---

Connor McDonald
Co-author: "Mastering Oracle PL/SQL - Practical Solutions" ISBN: 1590592174 web: http://www.oracledba.co.uk
web: http://www.oaktable.net
email: connor_mcdonald_at_yahoo.com

Coming Soon! "Oracle Insight - Tales of the OakTable"

"GIVE a man a fish and he will eat for a day. But TEACH him how to fish, and...he will sit in a boat and drink beer all day"

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Received on Fri Jul 02 2004 - 08:51:07 CDT