RE: Wrong results using decode when db upgraded to 9205
- From: "Duret, Kathy" <kduret@xxxxxxxxxxxxxxxxxxxx>
- To: "'oracle-l@xxxxxxxxxxxxx'" <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 5 May 2004 12:23:45 -0500
Thanks, I was wondering about the RULE hint..... hadn't gotten around to
testing it. And as far as unsupported goes... isn't that true with alot of
their "features" ....
Happy Cinqo de Mayo to all you none French people out there.
KD
-----Original Message-----
From: Daniel Fink [mailto:Daniel.Fink@xxxxxxx]
Sent: Wednesday, May 05, 2004 12:05 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: Re: Wrong results using decode when db upgraded to 9205
Contrary to rumor, the RBO is alive and well in 10g (though
supposed to be on it's last legs).
Here is selected output from a trace file:
Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 -
64bit Production
<snip>
PARSING IN CURSOR #2 len=134 dep=0 uid=33 oct=3 lid=33
tim=1333462250010 hv=4175702228 ad='8d947228'
select /*+ rule */ p.name, t.synopsis, s.name
from p, t, s
where p.id = t.project
and s.project = p.id
END OF STMT
PARSE
#2:c=10000,e=8169,p=0,cr=0,cu=0,mis=1,r=0,dep=0,og=3,tim=1333462249984
In the PARSE #2 line og=3 means that the optimizer_goal is RULE
(og Optimizer goal: 1=All_Rows, 2=First_Rows, 3=Rule, 4=Choose )
QED, YMMV, IMHO, Yada Yada Yada...
Daniel
"Duret, Kathy" wrote:
>
> A question about using the Rule hint for new code?
>
> Forgive me, but isn't the rule going away in 10G and I would assume the
rule
> hint would no longer work or rather be ignored in 10G so why put rule into
> new code to have to rewrite it when you migrate to 10G.
>
> Haven't tested it in 10G so I don't know for sure. Has anyone?
>
> Kathy
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