Is there any negative impact disabling view merging?

Hi
To fix an ORA error, it was suggested to set :
simpleview_merging=FALSE
complexview_merging=FALSE
bug is still on Development and customer wants to know the impact,implications of
disabling view merging and if there is any way to identify queries that currently does
simple and/or complex view merging.
For the second one, I guess the answer is no, I just want double check.
Oracle version: 11.2.0.1
Thanks,
Deyanira

Doing system-wide change is always a big challenge.
Since you know what queries are affected by the bug, why don’t you set those parameters for those queries only.
alter session set "_simple_view_merging"=FALSE ;
Buggy query…
alter session set "_simple_view_merging"=TRUE ;You can play with OPT_PARAM hint, but I do not think it is documented hint.
Iordan Iotzov
http://iiotzov.wordpress.com/
Edited by: Iordan Iotzov on Dec 6, 2011 12:42 PM

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