Recovering After Losing All Members of an Online Redo Log Group
ocp 053
709. A database has three online redo log groups wi th one member each. A redo log member with the
status ACTIVE is damages while the database is running.
What is the first step you should take to solve this problem?
A.Attempt to Issue a checkpoint.
B.Restart the database usi ng the RESETLOGS option.
C.Drop the redo log number and create it in a different location.
D.Perform and incomplete recovery up to the most recent available redo log.
Answer: C
答案解析：
参考：http://docs.oracle.com/cd/E11882_01/backup.112/e10642/osadvsce.htm#BRADV90049
根据官方文档，此题应该选A
Recovering After Losing All Members of an Online Redo Log Group
If a media failure damages all members of an online redo log group, then different scenarios can occur depending on the type of online redo log group affected by the failure and the archiving mode of the database.
If the damaged online redo log group is current and active, then it is needed for crash recovery; otherwise, it is not. Table 30-4 outlines the various recovery scenarios.
Table 30-4 Recovering After the Loss of an Online Redo Log Group
| If the Group Is... | Then... | And You Should... |
|---|---|---|
|
Inactive |
It is not needed for crash recovery |
Clear the archived or unarchived group. |
|
Active |
It is needed for crash recovery |
Attempt to issue a checkpoint and clear the log; if impossible, then you must either use Flashback Database or restore a backup and perform incomplete recovery up to the most recent available redo log. |
|
Current |
It is the redo log that the database is currently writing to |
Attempt to clear the log; if impossible, then you must either use Flashback Database or restore a backup and perform incomplete recovery up to the most recent available redo log. |