单项选择题
A. the system change number
B. the locations of the redo log files
C. the locations of the datafiles
D. the physical location of all the database changes
单项选择题 In which scenario， will you issue the following command？（） RMAN> REPORT NEED BACKUP DAYS 7；
单项选择题 Youissuedthefollowingcommand：ALTERDATABASEENABLEBLOCKCHANGETRACKING；Whatwillbetheresultofissuingthiscommand？（）
单项选择题 You have configured your database to use RMAN for backup and recovery. You must back up the datafile contained in the TS1 tablespace. The size of the datafile in the TS1 tablespace is 200 MB. You issue the following command from the RMAN prompt to perform a backup of the tablespace： RMAN> BACKUP TABLESPACE TS1 MAXSETSIZE 100M； Which statement is true about executing this command？（）