Which, process will read the redo log of the failed instance to identify the database blocks…?

Your two-instance RAC database is running in ARCHVELOG. The instance running on node1.,
fails and this failure Is ejected by the instance running on node2,which indicates the recovery
process for node1.
Which, process will read the redo log of the failed instance to identify the database blocks that
need to be recovered during the recovery process, after the configuration of enqueue and cache
part of Global resource Directory (GRD)?

A.
PMON

B.
MMON

C.
SMON

D.
GES

E.
GCS

Explanation:
Instance Recovery and Database Availability
The graphic illustrates the degree of database availability during each step of Oracle instance
recovery:
1. Real Application Clusters is running on multiple nodes.
2. Node failure is detected.
3. The enqueue part of the GRD is reconfigured; resource management is redistributed to the
surviving nodes.
This operation occurs relatively quickly.
4. The cache part of the GRD is reconfigured and SMON reads the redo log of the failed instance

to identify the database blocks that it needs to recover.
5. SMON issues the GRD requests to obtain all the database blocks it needs for recovery. After
the requests are complete, all other blocks are accessible.
6. The Oracle server performs roll forward recovery. Redo logs of the failed threads are applied to
the database, and blocks are available right after their recovery is completed.
7. The Oracle server performs rollback recovery. Undo blocks are applied to the database for all
uncommitted transactions.
8. Instance recovery is complete and all data is accessible.
Note: The dashed line represents the blocks identified in step 2 in the previous slide. Also, the
dotted steps represent the ones identified in the previous slide.
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Oracle 11g: RAC and Grid Infrastructure Administration Accelerated 14 – 7