多选题Which two database operations can be performed at the MOUNT stage of database startup？（）Arenaming of data filesBdropping the database userCrenaming of control filesDmultiplexing of control filesEconfiguring the database in ARCHIVELOG mode

第1题：

第2题：

Which three tasks can be performed using regular expression support in Oracle Database 10g？（）

• A、 it can be used to concatenate two strings.
• B、 it can be used to find out the total length of the string.
• C、 it can be used for string manipulation and searching operations.
• D、 it can be used to format the output for a column or expression having string data.
• E、 it can be used to find and replace operations for a column or expression having string data.

第3题：

第4题：

You executed the following query in your database： SELECT oldest_flashback_scn， oldest_flashback_time FROM V$FLASHBACK_DATABASE_LOG； What would you determine from the output？（）

• A、 The time when the last flashback operation in your database was performed.
• B、 The time when the first flashback operation in your database was performed.
• C、 A list of flashback operations performed in your database using SCN and time.
• D、 The approximate time and the lowest system change number （SCN） to which you can flash back your database.

第5题：

After performing a clean shut down of the database instance for maintenance， you mount the database andthen execute a command to open the database：SQL> ALTER DATABASE OPEN； Which two statements are true（）

• A、The online redo log files and online data files are opened.
• B、All the online data file headers are checked for consistency.
• C、Instance recovery is performed before opening the database.
• D、The path and existence of all the log file members are checked

第6题：

第7题：

Which two statements are true about the duplexing of the backups taken by RMAN? （）(Choose two.)

• A、It's only supported for the backups performed on the tape
• B、It is not supported for backup operations that produce image copies
• C、Duplex backups need a parallelism for the device to be equal to number of copies
• D、Duplex backups can be performed to either disk or tape, but cannot be performed on tape and disk simultaneously

第8题：

第9题：

Which two statements are true about the duplexing of the backups taken by RMAN？（）  

• A、 It’s only supported for the backups performed on the tape
• B、 It is not supported for backup operations that produce image copies
• C、 Duplex backups need a parallelism for the device to be equal to number of copies
• D、 Duplex backups can be performed to either disk or tape， but cannot be performed on tape and disk simultaneously

第10题：

You want to perform an RMAN backup of database as a copy. Which two factors will you consider whileperforming the backup operation?（） (Choose two).

• A、The backup as copy can only be taken to disk
• B、The backup as copy can only be taken to tape
• C、Backup can be performed only when the instance is shutdown
• D、Backup will constitute all used and unused blocks in the database