Which option is best practice for creating a recovery catalog owner in the catalog database？（）  

单项选择题The database is running in the ARCHIVELOG mode. It has three redo log groups with one member each. One of the redo log groups has become corrupted. You have issued the following command during the recovery of a damaged redo log file：   ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP 3；   Which action should you perform immediately after using this command？（）

A. You should perform a log switch
B. You should make a backup of the database
C. You should switch the database to the NONARCHIVELOG mode
D. You should shut down the database instance and perform a complete database recovery

单项选择题In Recovery Manager （RMAN）， you are taking image copies of the data files of your production database and rolling them forward at regular intervals. You attempt to restart your database. After a regular maintenance task， you realize that one of the data files that belongs to the USERS tablespace is damaged and you need to recover the data file by using the image copy. Because a media failure caused the data file to be damaged， you want to place the data file in a different location while resto ing the file.  Which option must you consider for this task？（）

A. using only the RMAN SWITCH command to set the new location for the data file
B. placing the database in the MOUNT state for the restore and recovery operations
C. using an RMAN RUN block with the SET NEWNAME and then the SWITCH command
D. configuring two channels： one for the restore operation and the other for the recovery operation

单项选择题WhichoptionsmustyouconfigurewhileperforminganautomatedTablespacePoint-in-TimeRecovery（TSPITR）byusingRecoveryManager（RMAN）？（）

A. New channels for restore and recovery tasks
B. New name for the data files of the tablespace
C. Auxiliary name for the data files of the tablespace
D. Auxiliary destinations for an auxiliary set of data files

多项选择题Your database is running in ARCHIVELOG mode. One of the data files， USERDATA01.dbf， in the USERS tablespace is damaged and you need to recover the file until the point of failure. The backup for the datafile is available.  Which three files would be used in the user-managed recovery process performed by the database administrator （DBA）？（）

A. Redo logs 
B. Control file
C. The latest backup of only the damaged data file
D. The latest backup of all the data file in the USERS tablespace
E. Temporary files of temporary tablespace
F. Archive Logs since the latest backup to point of failure

单项选择题You work with a newly created database. Presently， there is no application load on the database instance. You want to create a baseline for tuning the application， so you decide to collect recommendations that can be implemented to improve application performance.  What action must you take to achieve this？（）

A. Run Segment Advisor
B. Run the SQL Tuning Advisor （STA）
C. Run the Automatic Workload Repository （AWR） report
D. Run the SQL Access Advisor with a hypothetical workload