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Flashback is enabled for your multitenant container database (CDB), which contains two pluggable database (PDBs). A local user was accidently dropped from one of the PDBs.You want to flash back the PDB to the time before the local user was dropped. You connect to the CDB and execute the following commands:SQL > SHUTDOWN IMMEDIATE SQL > STARTUP MOUNT SQL > FLASHBACK DATABASE to TIME TO_DATE (‘08/20/12’ , ‘MM/DD/YY’)”;Examine following commands:1. ALTER PLUGGABLE DATABASE ALL OPEN;2. ALTER DATABASE OPEN;3. ALTER DATABASE OPEN RESETLOGS;Which command or commands should you execute next to allow updates to the flashback back schema？（）

A. Only 1

B. Only 2

C. Only 3

D. 3 and 1

E. 1 and 2

A. ALTER DATABASE FLASHBACK ON;

B. GRANT SELECT any transaction TO scott;

C. GRANT EXECUTE ON dbms_flashback TO scott;

D. ALTER DATABASE ADD SUPPLEMENTAL LOG DATA;

E. ALTER TABLESPACE undots1 RETENTION GUARANTEE;

F. ALTER DATABASE ADD SUPPLEMENTAL LOG DATA (PRIMARY KEY) COLUMNS;

A. The source database backup must be copied over the net for test database.

B. The source database must be run in ARCHIVELOG mode if the database is open.

C. The source database must be shut down cleanly if the database is in mounted state.

D. A net service name should be set up and a listener configured with the target as well as the source database.

A. ALTER DATABASE FLASHBACK ON;

B. GRANT SELECT any transaction TO scott;

C. GRANT EXECUTE ON dbms_flashback TO scott;

D. ALTER DATABASE ADD SUPPLEMENTAL LOG DATA;

E. ALTER TABLESPACE undots1 RETENTION GUARANTEE;

F. ALTER DATABASE ADD SUPPLEMENTAL LOG DATA (PRIMARY KEY) COLUMNS;

You create a job that contains the following steps:

--Detach the msdb database

--Send the database to the administrator in an e-mail message

--Reattach the msdb database

You test the job, and it fails on the first step. You need to ensure that the msdb database is mailed to the administrator every night.

What should you do？

A．Ensure that the SQLServerAgent service is running under a user account that has database owner access to the msdb database

B．Delete the first and last steps in the job

C．Configure the job to back up the msdb database to a temporary file. Send the file to the administrator in an e-mail message

D．Insert a new job step before the first step. Configure the new step to terminate all processes that use the msdb database

A. It results in an error because these parameter settings are invalid.

B. One 64G flash cache file will be used.

C. Two 64G flash cache files will be used.

D. Two 32G flash cache files will be used.

A. Check the alert log file

B. Query the V$FLASHBACK_DATABASE_LOG view

C. Query the V$RECOVERY_FILE_DEST_SIZE view

D.Query the V$FLASHBACK_DATABASE_STAT view

E. Check the value assigned for the UNDO_RETENTION parameter

You are using Recovery Manager (RMAN) with a recovery catalog to back up your production database. Thebackups and the archived redo log files are copied to a tape drive on a daily basis.Because of media failure,you lost your production database completely along with the recovery catalog database.You want to recover the target database and make it functional. You consider performing the following steps to accomplish the task:1) Restore an autobackup of the server parameter file.2) Restore the control file3) Start the target database instance4) Mount the database5) Restore the data files6) Open the database with RESETLOGS option7) Recover the data files8) Set DBID for the target databaseWhich option illustrates the correct sequence that you must use？（）

A.8，1，3，2，4，5，7，6

B.1，8，3，4，2，5，7，6

C.1，3，4，2，8，5，6，7

D.1，3，2，4，6，5，7，8