053第502題，053502

053第502題，053502
502.A database is running In ARCHIVBXXMS mode. It has two online redo log groups and each group
has one member.
A LGWR Input/output (I/O) fells due to permanent media failure that has resulted In the loss of redo log
file and the LWGR terminates causing the instance to crash. The steps to recover from the loss of a
current redo log group member in the random order are as follow.
1) Restore the corrupted redo log group.
2) Restore from a whole database backup.
3) Perform incomplete recovery.
4) Relocate by renaming the member of the damaged online redo log group to a new location.
5) Open the database with the RESETLOGS option.
6) Restart the database instance.
7) Issue a checkpoint and clear the log.
Identify the option with the correct sequential steps to accomplish the task efficiently.
A. 1, 3, 4, and 5
B. 7, 3, 4. and 5
C. 2, 3, 4, and 5
D. 7, 4, 3. and 5
E. Only 6 is required

Answer: C

原答案為B，應該為C

If the log group is in the CURRENT state, then it is, or was, being actively written to at the time of the
loss. You may even see the LGWR process fail in this case. If this happens, the instance crashes.
Your only option at this point is to restore from backup, perform cancel-based point-in-time
recovery, and then open the database with the RESETLOGS option.

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