Hi Ryan
What version of Oracle and OS are you running? What hint did you try to
use? How complex was query?
I have seen a case (OK it was 7.3.4.0 in 1999 on Sun's OS) where two
databases - same version, same OS same Oracle and OS patches on both -
hardware configuration was slightly different (not 100% sure but there
were differences in RAM (1G vs 2G or 4G) and number of CPUs - (2 vs 4)
and some disk layout differences) both databases running RULE (software
vendor requested [Keystone - if you have ever heard of it]) - identical
statement (cut and paste between two terminal sessions (and back))
generating very different execution plans.
I tried to verify few times and results were consistently different.
Nothing would surprise me any more.
Kind regards
Kresimir Fabijanic
ryan.gaffuri@xxxxxxx wrote:
We had a discussion on here regarding hints. some of you stated that Oracle cannot ignore a proper hint. I have a TAR open and asked about this. Here is the response.
"A hint simply adds weight to a cost estimation, it can still be overridden by the CBO if the values aren't seen as useful."
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