多项选择题

These are the details about V$FLASHBACK_DATABASE_STAT：
SQL> DESC V$FLASHBACK_DATABASE_STAT Name Null？ Type
------------- -------- --------------
BEGIN_TIME DATE END_TIME DATE
FLASHBACK_DATA NUMBER
DB_DATA NUMBER REDO_DATA NUMBER
ESTIMATED_FLASHBACK_SIZE NUMBER
Which two statements regarding the V$FLASHBACK_DATABASE_STAT view are true？（）

A.BEGIN_TIME is the time at which Flashback logging is enabled.
B.END_TIME is the time at which the query is executed on the view.
C.REDO_DATA is the number of bytes of redo data written during the interval.
D.This view contains information about flashback data pertaining to the last 24 hours.
E.FLASHBACK_DATA is the amount of flashback data generated since the database was opened.

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多项选择题

You are using Oracle Database 10g. You performed an
incomplete recovery of your database and opened the database with the RESETLOGS option.
What is the effect of opening the database with the RESETLOGS option？（）

A.This operation resets the SCN for the database.
B.This operation creates a new incarnation of the database.
C.This operation moves all the redo log files to a different location.
D.This operation deletes the old redo log files and creates new redo log files.
E.This operation updates all current datafiles and online redo logs and all subsequent archived redo logs with a new RESETLOGS SCN and time stamp.

单项选择题

You executed the following command in Recovery Manager （RMAN）：
RMAN> RESTORE CONTROLFILE；
Which operation must you perform before this command is executed？（）

A.back up the control file to trace
B.bring database to the MOUNT state
C.open a connection to the RMAN recovery catalog， which contains the RMAN metadata for the target database
D.set the database ID （DBID）， but only if the DB_NAME parameter associated with the target database is unique in the recovery catalog

单项选择题

You lost a temporary file that belongs to the default temporary tablespace in your database. From the options provided， which approach would you take to solve the problem？（）

A.flash back the database
B.import the temporary tablespace from the last export
C.restore all the data files and temporary files from the last full database backup and perform a recovery
D.not perform a recovery， but create a new temporary tablespace， make it the default temporary tablespace and then drop the old tablespace