Re: Anyone seen weblogic do this?

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).

In 8i there is no x$dual, there you could use a single table hash cluster or
IOT with relevant view on it to reduce dual cost (an unique scan on single
block IOT takes only 1 LIO compared to 3 that FTS makes on a single block
table).

Tanel.

----- Original Message ----- 
From: " L. Trindle Gennari" <initltg@xxxxxxxxxxxxx>
To: <oracle-l@xxxxxxxxxxxxx>
Sent: Friday, July 02, 2004 4:08 AM
Subject: RE: Anyone seen weblogic do this?


> We ran into that too. Did a sql trace on the whole instance and discovered
that it was spending 80% of its time doing select 1 from dual.
>
> ltg
> ----------------------------------------------------------------
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> ----------------------------------------------------------------
> To unsubscribe send email to:  oracle-l-request@xxxxxxxxxxxxx
> put 'unsubscribe' in the subject line.
> --
> Archives are at http://www.freelists.org/archives/oracle-l/
> FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html
> -----------------------------------------------------------------
>


----------------------------------------------------------------
Please see the official ORACLE-L FAQ: http://www.orafaq.com
----------------------------------------------------------------
To unsubscribe send email to:  oracle-l-request@xxxxxxxxxxxxx
put 'unsubscribe' in the subject line.
--
Archives are at http://www.freelists.org/archives/oracle-l/
FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html
-----------------------------------------------------------------

Other related posts: