Daniel Morgan <damorgan_at_x.washington.edu> wrote in message news:<1097040504.120175_at_yasure>...
> Dusan Bolek wrote:
>
> > My advice based on my experiences with RAC is never use RAC, if there
> > is any way how to do the job without it! .
>
> My advice, based on experience at little organizations like The Boeing
> Company, AT&T Wireless, and Amazon.com is that RAC is wonderful when
> properly implemented and produces great scalability with costs far below
> that of SMP.
>
> If you are having problems I can put you in contact with a consultant
> that can help you: Just contact me off-line.
I'm not saying that RAC is crappy and useless, there are very good
reasons for implementing RAC technology in some cases. However, I do
not see RAC as a general solution for anyone. Keg said that he is
unable to tune his SGA and that's the reason why he looks for RAC. I
wrote him that most likely he is not going to solve anything.
My approach when implementing systems is to keep it as simple as
possible, RAC is definitely a complication and all complications in a
design must be well reasoned. There are reasons for implementing RAC
such as need for very quick failover in the case of a failure or an
application demand above the reasonable scaling level of single node
system. However, for a majority of applications I believe single mode
is still a way to go.
And if we're talking about problems, just look to the Metalink and you
can easily find several quite nasty problems still remaining after
9.2.0.5 patchset (which is not very good one anyway). Just imagine how
would you feel, when you encounter some of them on your business
critical 24x7 system and everyone around is shouting on you. Well, you
can tell them that "The Boeing Company, AT&T Wireless, and Amazon.com"
are not having this problem. :-)
Right now, I have a problem with cross-archivation between nodes which
is simply not working. I have a brand new bug created on this, but
there is at least another one bug related to this (should be solved by
9.2.0.6 as promised).
--
Dusan Bolek
http://www.db-support.com
Email: spambin_at_seznam.cz
Pls add "Not Guilty" to the subject, otherwise your email will face an
unpleasant end as SPAM.
Received on Wed Oct 06 2004 - 09:56:53 CDT
