Re: RAC or Oracle Fail Safe

And to add to that, I don't believe that FailSafe is even required to use Oracle with MS Clusters.

IIRC, it's just to simplify the cluster setup.

FailSafe certainly isn't need for setting up failover withi Veritas Cluster Server.

Jared

"Allen R. Lucas" <alucas_at_chicagobridge.com> Sent by: ml-errors_at_fatcity.com
 07/16/2003 10:59 AM
 Please respond to ORACLE-L  

        To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
        cc: 
        Subject:        Re: RAC or Oracle Fail Safe

EE is not required to FailSafe. It comes at no cost with Standard Edition as well.   

                    "Tanel Poder"   
                    <tanel.poder.00        To:     Multiple recipients of 
list ORACLE-L <ORACLE-L_at_fatcity.com> 
                    3_at_mail.ee>             cc:    
                    Sent by:               Subject:     Re: RAC or Oracle 
Fail Safe 
                    ml-errors_at_fatci   
                    ty.com   
  
  
                    07/16/2003   
                    12:44 PM   
                    Please respond   
                    to ORACLE-L   
  
  

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, in event of
failure you can start up instance on another node that will mount, recover and open the database.

With RAC you can have some kind of transparent failover which is able to reexecute your queries on survived instance, but AFAIK for uncommitted transaction survivability your app has to be coded to support it. Also, with
RAC you may scale your system up to support more users in some cases.

RAC is additional $20k per CPU, FailSafe comes with EE, I believe.

Tanel.

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Wednesday, July 16, 2003 7:44 PM

> Hello all,
>
> We have setup a Microsoft Cluster Server (MSCS) cluster, with two nodes,
using W2K, and now are in the process of deploying Oracle 9i on it. For the
purpose of high availability (HA), we are deliberating on setting up either
RAC or Oracle Fail Safe. The confusion is over the fact that if we get HA with oracle Fail Safe, i.e. if one node is down due to any problem, then the
other takes over, then can we do without RAC?
> Which of these two is more transparent to the user, i.e. which will take
less time to shift the load from one node (server) to the other node?
> Can any one explain the benefits of using RAC over Oracle Fail Safe, or
vice versa.
>
> Regards,
>
> Hussain
>
> DBA SKMCH&RC
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Hussain Ahmed Qadri
> INET: hussain_at_skm.org.pk
>
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