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RAC Instance recovery using Past Image [message #342342] Fri, 22 August 2008 01:33 Go to next message
gajini
Messages: 262
Registered: January 2006
Senior Member
Hi,

How recovery will take place if the instance/node having the latest Past Image(PI) of the blocks got crashed?

Thanks..

[Updated on: Fri, 22 August 2008 01:41]

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Re: RAC Instance recovery using Past Image [message #342347 is a reply to message #342342] Fri, 22 August 2008 01:49 Go to previous messageGo to next message
Michel Cadot
Messages: 68716
Registered: March 2007
Location: Saint-Maur, France, https...
Senior Member
Account Moderator
Oracle can reconstruct it from what's inside data files and redo logs.

Regards
Michel

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Re: RAC Instance recovery using Past Image [message #342357 is a reply to message #342342] Fri, 22 August 2008 02:10 Go to previous message
gajini
Messages: 262
Registered: January 2006
Senior Member
Thanks Michel.

Correct me if I'm wrong.As per my understanding(read from Oracle doc),the RAC Instance recovery will take place as follows

1. Instance/node failure is detected.
2. GRD is rebuilt.
3. Which blocks needs recovery is identified using GRD.
4. Then,recovery will start using redo logs.

If i missed any steps in this recovery process,please provide that one also and confirm whether the step 3 is correct or not.

I'm still not clear about the usage of & keeping Past Image in each instances,can anyone please explain its usage with a failure scenario?

Thanks..

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