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  Oracle Database Tips by Donald Burleson

Oracle10g Grid Computing with RAC
Chapter 7 - Cache Fusion and Inter Instance Coordination

Recovery Methodology and steps

Now the second pass of recovery begins and redo is applied to data files, releasing the recovery resources immediately after block recovery, so that more and more blocks become available as cache recovery proceeds.

  1. After all blocks have been recovered and recovery resources have been released, the system is available for normal use.

Figure 7.7 shows the basic steps in the recovery.

Figure 7.7 Online Instance Recovery Steps

Recovery Process - Re-mastering Resources

The recovery process is done in two passes. The first pass will construct recovery sets and the appropriate lock modes, after eliminating the 'not needed' entries like BWR. This process makes use of extra buffers in the recovering instance's cache to store the recovery list. In the second pass, the actual recovery of the blocks takes place, and redo is applied to the data files.


Let us examine some of these situations and understand how the process works.


Assume we have RAC with three instances (A, B, C) and instance C has failed. Instance A has taken over the role of recovering instance and instance B is an open, good instance. The situation is constructed as if the failed instance existed.

The above text is an excerpt from:

Oracle 10g Grid & Real Application Clusters
Oracle 10g Grid Computing with RAC
ISBN 0-9744355-4-6

by Mike Ault, Madhu Tumma


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