Title: RE: RAC or Oracle Fail Safe
Hi!
Of
course you have to plan your servers' capacity accordingly, that in the event of
node failure, the other node will not get too loaded. When one node crashes, the
second one has to deal with queries and transactions of both servers and we must
Title: RE: RAC or Oracle Fail Safe
Hi Rajesh,
Thanks for
the detailed reply and I really appreciate that. Certain clarifications.
1.
With reference to what you said about using both the
nodes, you meant that we can install another database (lets say for reporting purpose)
or/and also
Title: RE: RAC or Oracle Fail Safe
Hi Hussain,
Replies
are inline .
With
reference to what you said about using both the nodes, you meant that we can
install another database (lets say for reporting purpose) or/and also 9iAS on
one node and our main production database
Thank you to all those who replied and who intend to reply to this one :)
We are using Dell PE4600 servers. My concern was that I read it somewhere that if one
of the node goes down, then the clients have to restart the application to log in
again to the database, is that true? And is it any
Title: RE: RAC or Oracle Fail Safe
Hi Hussain !
RAC can have Active-Active or Active-Passive combination for two nodes. While OFS can't give you Active-Active combination of two nodes. Basically a resource sharing is not possible in Oracle Fail safe so one resource can be used by only one
Title: RE: RAC or Oracle Fail Safe
Answers in line...
-- I also believe that setting up RAC is more complex,
That's not totally true, For a DBA it shouldn't matter much, whether he is setting up RAC or OFS. But yes relatively RAC is a bit complex to manage.
-- and any change in node
One other note is that we have not had to failover due to a Win2K of Oracle
problem in 18 months of running failsafe. We have found it to be extremely
stable just not scalable froma CPU standpoint.
I totally agree with this. I am running FailSafe here also. The *only*
failover's I experience is
Hi!
RAC - One database, two (or more) instances servicing it concurrently. If
one node crashes, second one starts recovering, your uncommitted
transactions and session state variables (package variables) on failed
instance are lost.
FailSafe - One database, one instance servicing it at any time,
FailSafe comes with EE and works very well. It might even come with SE but I am not
sure. Our
production environment fails over in less than 2 minutes. It is much simpler to set up
( ie no
SAN, raw devices or OCFS) and a heck of a lotr cheaper ( 20K$ / CPU for RAC ). One
other
note is that we
:
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Subject:Re: RAC or Oracle Fail Safe
EE is not required to FailSafe. It comes at no cost with Standard Edition
as well
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