单项选择题

In which scenario will you perform an incomplete recovery？（）

A. when a table is dropped and stored in the Recycle Bin
B. when all the control files are deleted
C. when a member of a multiplexed redo log group is dropped
D. when you are required to recover a table to its previous state

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You are working as a DBA in a company. The datafiles in the database are as follows：

On Monday， you tried to start up the database but failed because all the control files were missing. You recreated the control file using the script you have created by issuing the ALTER DATABASE BACKUP CONTROLFILE TO TRACE command. What is the prerequisite for recreating the control file？（）

A. All the datafiles should be listed in the CREATE CONTROLFILE statement.
B. The DATA2.dbf and DATA3.dbf datafiles should be listed in the CREATE CONTROLFILE statement.
C. The SYSTEM01.dbf datafile should be listed in the CREATE CONTROLFILE statement.
D. The SYSAUX01.dbf datafile should be listed in the CREATE CONTROLFILE statement.

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Your database is in ARCHIVELOG mode. You lost an index tablespace due to a disk failure while the database was open. You have neither a backup of the lost index tablespace nor the scripts containing the CREATE INDEX statements to recreate the indexes. Currently， several users are executing long-running queries on the database. What will happen to the ongoing activity in the database？（）

A. The queries that are currently executing will abort and an error message will be returned to the user.
B. The queries that are currently executing will execute normally but future queries will not executed.
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You are maintaining your database in Oracle10g. You find that the INDEXES index tablespace should be recovered. How will you recover the index tablespace？（）

A. by using the Flashback Database feature
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C. by performing a user-managed incomplete recovery
D. by dropping and re-creating the index tablespace