OCP-1Z0-053-V12.02-184题
184.Which RMAN backup command is used to create the block-change tracking file?A. alter database create block change tracking file
B. alter database enable block change file
C. alter database enable block change tracking using file ,,/ora01/opt/ block_change_tracking.fil
D. alter system enable block change tracking using file '/ora01/opt/block_ change_tracking.fil'
E. alter system block change tracking on
Answer: C
答案解析：
参考：http://blog.iyunv.com/rlhua/article/details/12321679
You can enable block change tracking when the database is either open or mounted.
To enable block change tracking:
[*] Start SQL*Plus and connect to a target database with administrator privileges.
[*] Ensure that the DB_CREATE_FILE_DEST initialization parameter is set.
SHOW PARAMETER DB_CREATE_FILE_DEST If the parameter is not set, and if the database is open, then you can set the parameter with the following form of the ALTER SYSTEM statement:
ALTER SYSTEM SET DB_CREATE_FILE_DEST = '/disk1/bct/'SCOPE=BOTH SID='*';
[*] Enable block change tracking.
Execute the following ALTER DATABASE statement:
ALTER DATABASE ENABLE BLOCK CHANGE TRACKING; You can also create the change tracking file in a location that you choose yourself by using the following form of SQL statement:
ALTER DATABASE ENABLE BLOCK CHANGE TRACKINGUSING FILE '/mydir/rman_change_track.f' REUSE; The REUSE option tells Oracle Database to overwrite any existing block change tracking file with the specified name.
官方参考：http://docs.oracle.com/cd/E16655_01/backup.121/e17630/rcmbckba.htm#BRADV8125
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