RE: Convert 2-node RAC to single instance
- From: "Bobak, Mark" <Mark.Bobak@xxxxxxxxxxxx>
- To: "yong321@xxxxxxxxx" <yong321@xxxxxxxxx>, "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
- Date: Sat, 7 Feb 2009 22:41:16 -0500
Yong,
I don't have any definitive data, but, if I recall correctly, one of the
Oakies, maybe Bjorn Engsig(?), did a test, and found that running RAC binaries
on a single instance database caused a noticeable performance penalty over the
single instance binaries.
If I recall correctly, he was quoting around 12-15% performance hit? Sorry, I
don't remember details, and this was at least 2 years ago.....
I'll ping the Oaktable list see if I can get some follow up information.....
-Mark
________________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx [oracle-l-bounce@xxxxxxxxxxxxx] On Behalf
Of Yong Huang [yong321@xxxxxxxxx]
Sent: Saturday, February 07, 2009 6:24 PM
To: oracle-l@xxxxxxxxxxxxx
Cc: dannorris@xxxxxxxxxxxxx
Subject: Re: Convert 2-node RAC to single instance
Dan or anybody,
Do you think turning RAC option off is only done from a purist's point of
view or it has performance or other benefit? I can't think of any benefit
other than making the oracle binary smaller. But maybe code path is shorter
for some operations when RAC is off.
If anybody has performance comparison without and with RAC option on (but
cluster_database=false), I'd love to see.
Yong Huang
> 5. relink binaries to disable RAC
> ...
> Good catch on the relink--I forgot about that step.
>
> Dan
>
>> bao jiejie wrote:
>> And ... Do we need relink oracle binary to off the rac option?
>> like make -f ins_rdbms.mk rac on/off ??
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