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)?（）

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

单项选择题You issued the following commands to configure setting in RMAN; Then you issued the following command to take the backup: RMAN> BACKUP DATABASE PLUS ARCHIVELOG; Which statement is true about the execution of the above command?（）

A. The backup will terminate because the FORMAT clause was not configured for the channel
B. It backs up two copies of data files to tape and disk, and two copies of archived log file on tape
C. It backs up the data files and archived log files to disk, making two copies of each data file and archived log file
D. It backs up the data files and archived log files to tape, making two copies of each data file and archived log file

单项选择题You need to maintain a record of all transactions on some tables for at least three years. Automatic undo management is enabled for the database.What must you do accomplish this task?（）

A. Enable supplemental logging for the database.
B. Specify undo retention guarantee for the database
C. Create Flashback Data Archive in the tablespace where the tables are stored.
D. Create Flashback Data Archive and enable Flashback Data Archive for specific tables

多项选择题You have enabled backup optimization for the RMAN environment.Identify two criteria on which RMAN will skip the file, if it has already been backed up.（）

A. The data file backup is done with multiple channels
B. The data files is in the read-write mode after being backed up in the read only mode
C. The backup was taken after the data files was taken offline-normal or is in the read only mode
D. The data file backup complies with the back retention policy and the backup duplexing feature

多项选择题You are using the control file to maintain information about the database backups that are being performed by Recovery Manager (RMAN). Identify two scenarios is which you must have a recovery catalog.（）

A. To store the backup information of multiple database
B. To restrict the amount of space that is used by the backups
C. To maintain a backup for a certain time is set by the CONTROL_FILE_RECORD_KEEP_TIME parameter.
D. To list the data files that were in a target database at a given time by using the AT option of REPORT SCHEMA command.