Re: Anyone seen weblogic do this?
- From: Tanel Põder <tanel.poder.003@xxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 2 Jul 2004 16:31:10 +0300
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
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