High Availability Data Guard, Sharding and Global Data Services (MOSC)

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How does RAC consolidate the redo logs while recovery at standby site

edited May 27, 2009 11:45PM in High Availability Data Guard, Sharding and Global Data Services (MOSC) 4 commentsAnswered
Hi,

I have one doubt regarding RAC recovery on StandBy Site (or in general recovery mechanism of RAC), i am not able to figure

how the consolidation of the redo log files from 'N' instances is done and applied at target standby site.

Theortical Case

Lets assume there are 2 instances in a RAC environment, 2 session running on different instances.

T1 Session1 Makes an update (and commit) on Tab1.Col1 to vaule x on instance 1. Lets assume SCN1 at this time.
T2 Session2 Makes an update (and commit) on Tab1.Col1, Tab1.Col2 to vaule y and z resp on instance 2. Lets assume SCN2 at

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