Performing Time-Based or Change-Based Incomplete Recovery

OCP 053:

192.What is the purpose of the until change option of the restore
command?

A. It allows you to select the SCN that you want to restore
to.

B. It allows you to select the log sequence number you want to restore
to.

C. It allows you to select the timestamp you want to restore
to.

D. It allows you to manually stop the restore at any time as online
redo logs are applied.

E. None of the above.

Answer: A

答案解析：

参考：http://docs.oracle.com/cd/E11882_01/backup.112/e10642/osrecvry.htm#BRADV219

Performing Time-Based or Change-Based Incomplete Recovery

This section describes how to specify an SCN or time for the
end point of recovery. If your database is affected by seasonal time changes
(for example, daylight savings time), then you may experience a problem if a
time appears twice in the redo log and you want to recover to the second, or
later time. To handle time changes, perform cancel-based or change-based
recovery.

To perform change-based
or time-based recovery:

1. Follows Step 1 through Step 8 in "Performing Closed Database Recovery".


2. Issue
   the RECOVER DATABASE UNTIL statement
   to begin recovery. If recovering to an SCN, then specify as a decimal number
   without quotation marks. For example, to recover through SCN
   10034 issue:

   RECOVER DATABASE UNTIL CHANGE 10034;

   If recovering to a time, then the time is always specified using the
   following format, delimited by single quotation
   marks: ‘YYYY-MM-DD:HH24:MI:SS‘. The following statement
   recovers the database up to a specified time:

   RECOVER DATABASE UNTIL TIME ‘2000-12-31:12:47:30‘



3. Apply the necessary redo log files to recover the restored data files. The
   database automatically terminates the recovery when it reaches the correct
   time, and returns a message indicating whether recovery is successful.

   Note:

   Unless recovery is automated, the database supplies the
   name from LOG_ARCHIVE_DEST_1 and asks
   you to stop or proceed with after each log. If the control file is a backup,
   then after the archived logs are applied you must supply the names of the
   online logs.



4. Follow Steps 4 and 5 in "Performing Cancel-Based Incomplete Recovery".

Performing Time-Based or Change-Based Incomplete
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Performing Time-Based or Change-Based Incomplete
Recovery