单项选择题

You issued the following command to mount the DATA disk group in restricted mode：
ALTER DISKGROUP data MOUNT RESTRICT；
What is the implication of this command？（）

A. The client RDBMS instance can access the file as a read-only file.
B. A new disk cannot be added to a disk group.
C. A disk in a disk group can be taken offline.
D. The client RDBMS instance cannot access the files in the disk group.

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The ADMIN_EMP table has columns EMPNO， ENAME， DEPTNO， and SAL. It has a materialized view EMP_MV with a materialized log and an ENAME_IDX index on the ENAME column. You need to perform an online table redefinition on the ADMIN_EMP table to move it from the TBS1 tablespace to the TBS2 tablespace in the same schema.
What action is required for the dependent objects when you perform online redefinition on the table？（）

A. The materialized view should have a complete refresh performed after the online table redefinition is completed.
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D. The materialized view and materialized log should be dropped and all constraints disabled and re-created after the online table redefinition is complete.

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You are managing an Oracle Database 11g database. You want to take a backup on tape drives of the USERS tablespace that has a single data file of 900 MB. You have tape drives of 300 MB each. To accomplish the backup， you issued the following RMAN command：
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A. The backup contains data files， the server parameter file，and the control file even if the control file autobackup is disabled.
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C. The backup contains only data files and archived redo log files.
D. The KEEP option is an attribute of an individual backup piece.

You issued the following command to mount the DATA disk group in restricted mode： ALTER DISKGROUP data MOUNT RESTRICT； What is the implication of this command？（）

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You issued the following command to mount the DATA disk group in restricted mode：
ALTER DISKGROUP data MOUNT RESTRICT；
What is the implication of this command？（）