单选题Your Certkiller .com database is in ARCHIVELOG mode. The data file that belongs to the SYSTEMtablespacehas become corrupted. Up to what point can you recover the database？（）A Until last commitB Until the time you perform recoveryC Until the time the da

第1题：

You have only two redo log groups and these groups get overwritten several times in a day. Your database operates in NOARCHIVELOG mode and user-managed consistent backups are performed every Sunday night. On Thursday morning， you find that an important table has been dropped and purged. With reference to this scenario， up to what point in time can the data be recovered？（）

• A、 until Thursday morning
• B、 until that point in time when the database is opened
• C、 until that point in time when the recovery is performed
• D、 until last Sunday’s backup
• E、 until that point in time when the table is dropped and purged
• F、 until Wednesday evening

第2题：

Your Certkiller .com database is in ARCHIVELOG mode. The data file that belongs to the SYSTEMtablespacehas become corrupted. Up to what point can you recover the database？（）

• A、Until last commit
• B、Until the time you perform recovery
• C、Until the time the date file got corrupted
• D、Until the point where the last transaction begun
• E、You cannot recover the SYSTEMtablespaceand must re-create the database.

第3题：

You want to make sure that your database backup does not exceed 10 hours in length. What command would you issue that would meet this condition?（）

• A、backup database plus archivelog
• B、backup database plus archivlog until time ‘10:00‘
• C、backup database plus archivelog timeout ‘10:00‘
• D、backup database plus archivelog duration 10:00

第4题：

The database is running in NOARCHIVELOG mode. A data file is lost. Which two are valid options for recover？（）

• A、Restore the data file and perform incomplete recovery.
• B、Restore the data file and perform point-in-time recover.
• C、Drop the tablespace and lose all data in the tablespace.
• D、Restore the database and lose all data since the last backup.

第5题：

Your Supportcenter.cn database is in ARCHIVELOG mode. The data file that belongs to the SYSTEM tablespace has become corrupted. Up to what point can you recover the database？（）

• A、Until last commit
• B、Until the time you perform recovery
• C、Until the time the date file got corrupted
• D、Until the point where the last transaction begun
• E、You cannot recover the SYSTEMtablespaceand must re-create the database.

第6题：

Your database is in the NOARCHIVELOG mode. Since last night’s offline backup， the logs in group 1 have been written to twice. This morning， the SYSTEM data file has become corrupted. Up to what point can it be recovered？（）

• A、until the last commit
• B、cannot be recovered
• C、until the last offline backup
• D、until the beginning of the last transaction

第7题：

In your database， you discovered that a tempfile in a locally managed temporary tablespace has been deleted at the operating system level. How would you recover the tablespace？（）

• A、flash back the database
• B、perform point-in-time recovery
• C、perform a full database recovery
• D、drop and re-create the tablespace
• E、use Recovery Manager （RMAN） to recover the database

第8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

第9题：

You work as a database administrator for Certkiller .com. Your database is configured for automatic undo management. UNDO_RETENTION is set to 3 hours. You want to flash back a table that was created last year. How far back can the flashback query go？ （）

• A、3 hours
• B、6 months
• C、until last year
• D、until last commit
• E、until the point when the undotablespacewas refreshed
• F、until the database is shut down and the memory erased

第10题：

You need to restore your database back to 9/30/2008 at 18：00. In what order would you run the following commands to compete this task？（）   a. restore controlfile until time `09/30/2008：18：00：00’ b. restore database until time `09/30/2008：18：00：00’  c. restore spfile until time `09/30/2008：18：00：00’ d. recover database until time `09/30/2008：18：00：00’ e. alter database open resetlogs f. alter database open

• A、 b， d， e
• B、 b， d， f
• C、 c， a， b， d， e
• D、 c， a， b， d， f
• E、 a， b， d， e