单项选择题

What RMAN command is used to execute a tablespace point-in-time recovery？（）

A. recover
B. duplicate
C. restore
D. copy
E. None of the above

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单项选择题

You have configured flash recovery area in your database and you set the following Initialization parameters for your database instance： LOG_ARCHIVE_DEST 1 = ，，LOCATION= disk1 arch MANDATORY’ LOG _ARCHIEVE_DEST 2 = ，，LOCATION= disk2 arch’ LOG_ARCHIVK_DEST_3 = ，，LOCATION= diSk3 arch LOG_ARCH1VK_DEST_4 = ’ LOCATION= disk4 arch’ LOG_ARCHIVE_MIN-SUCCEED_DEST = 2 While the database instance is functional，you realized that the destination set by the LOG_ARCHIVE_DEST_I parameter Is not available for the archived redo log file to be created in. All redo log groups have been used. What happens in an event of log switch？（）

A. The online redo log file Is not allowed to be overwritten.
B. The archived redo log files are written to the flash recovery area until the MANDATORY destination is made available.
C. The database instance will crash because the archived redo log file cannot be created in a destination set as MANDATORY.
D. The destination set by the LOG_ARCHIVE_DEST_1 parameter is ignored and the archived redo log files are created in the next two available locations to guarantee archive log success.

单项选择题

You executed the following command in Recovery Manager （RMAN）： RMAN> REPORT NEED BACKUP days 3； What is the output of this command？（）

A. a list of files that require a backup within three days
B. a list of files requiring more than 3 days of archive logs to apply
C. a list of files that RMAN recommends be backed up only once in every three days，based on low volatility
D. a list of files for which a backup has already been performed in the last three days and which is required to be backed up again based on the high number of transactions performed on them