Re: SCN scheme 3

On my 9iRAC 9.2.0.2 Database I set max_commit_propagation_delay to 0, yet the alert.log indicates that the Instance is starting with Lamport Server SCN generation. I wonder why.
Hemant
At 12:04 PM 07-04-03 -0800, you wrote:

>Since no-one else has answered, I'll
>take a guess.
>
>Historically OPS used to have two options
>for synchronising SCNs across multiple
>instances, 'broadcast on commit' and 'Lamport'.
>The default was Lamport, but if you modified the
>max_commit_propagation_delay downwards from
>its default value of 700 (centiseconds) then at
>some low value (possibly about 10) the database
>would switch to 'broadcast on commit'.
>
>I guess Oracle have come up with a clever new
>(lazy ?) way of maximising the degree of synchronisation
>whilst minimising the delay at any one instance, and
>called it 'Scheme 3'.
>
>Have you modified the value of max_commit_propagation_delay
>or any other parameter which looks like a timing
>parameter to make this happen ? Or are you on some
>platform with a super-low latency for messaging ?
>
>
>Regards
>
>Jonathan Lewis
>http://www.jlcomp.demon.co.uk
>
> The educated person is not the person
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>----- Original Message -----
>To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
>Sent: 28 March 2003 21:18
>
>
> > List, does anybody know what this means:
> >
> > SCN scheme 3
> >
> > It occurs it the alert log upon startup.
> > thanks,
> >
> > David Ehresmann
> >
>
>
>--
>Please see the official ORACLE-L FAQ: http://www.orafaq.net
>--
>Author: Jonathan Lewis
> INET: jonathan_at_jlcomp.demon.co.uk
>
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Hemant K Chitale
My personal web site is : http://hkchital.tripod.com

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  INET: hkchital_at_singnet.com.sg

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