Which three tasks can be performed using a duplicate database？（）

单项选择题Examine the CREATE DISKGROUP command used to create a disk group：   SQL> CREATE DISKGROUP misc EXTERNAL REDUNDANCY  DISK ’ORCL： FRA3’ NAME misc1， ’ORCL： FRA4’ NAME misc2；   In which situation would you use this method of disk group creation？（）

A. When two-way disk mirroring is required for the allocation units
B. When three-way disk mirroring is required for the allocation units
C. When using hardware mirroring or RAID
D. When disk mirroring is required for the Automatic Storage Management （ASM） disks

多项选择题Whichtwostatementsaretrueaboutajobchain？（）

A. A job chain can contain a nested chain of jobs
B. The jobs in a job chain cannot have more than one dependency
C. A job of the CHAIN type can be run using event-based or time-based schedules
D. The jobs in a job chain can be executed only by using the events generated by the Scheduler

单项选择题View the Exhibit and examine the disk groups created at the time of migrating the database storage to Automatic Storage Management （ASM）.  Why does the FRA disk group initially have more free space even though both DATA and FRA disk groups are provided with the same size？（）

A. Because the FRA disk group will not support dynamic rebalancing
B. Because the FRA disk group is not configured to support mirroring
C. Because disks in the FRA disk group are not formatted at this stage
D. Because the FRA disk group will support only a single size of allocation unit

单项选择题In your production database， users report that they are unable to generate reports on an important table because it does not contain any data. While investigating the reason， you realize that another user executed the TRUNCATE TABLE command， which accidentally caused the data to be lost. Now you want to recover the lost data of the table without affecting objects in other schemas.  Which method must you use to recover the lost data？（）

A. Complete Recovery with online redo log
B. Complete Recovery with archived redo log
C. Tablespace Point-in-Time Recovery （TSPITR）
D. Incomplete Recovery with system change number （SCN）

多项选择题WhichthreefunctionsareperformedbytheSQLTuningAdvisor？（）

A. Building the SQL profile
B. Recommending optimization of materialized views
C. Checking query objects for missing and stale statistics
D. Recommending bitmap， function-based， and B-tree indexes
E. Recommending restructuring SQL queries that are using bad plans