多选题You work as a database administrator for Certkiller .com. Your database is in the MOUNT state and you execute the following command to open it ALTER DATABASE OPEN； What two actions are performed as a result of this command？（）AAll control files are open

第1题：

You work as a database administrator for Supportcenter.cn. You added atablespaceto your database. Because of the changes to the physical structure of your database， you performed a backup of the control file to trace. After this， you lost only the control files and the instance aborted due to a hardware failure. How would you proceed to recover the database？（）

• A、Start the instance and open the database， instance recovery automatically recoverscontrol files
• B、Create a file based on the contents of the trace file and save it to the control file locations and start the database
• C、Re-create the database （The recovery of the control file is not possible because you have lost all the control files.）
• D、Start the instance， in the NOMOUNTstate，re-create the control file using the CREATE CONTROLFILE command stored in the trace file.
• E、Start the instance and MOUNT the database， then re-create the control file using the CREATE CONTROLFILE command stored in the trace file.

第2题：

You realize that the control file is damaged in your production database.After restoring the control file from autobackup, what is the next step that you must do to proceed with the database recovery?（）

• A、Mount the database
• B、Open the database in NORMAL mode
• C、Open the database in RESTRICTED mode
• D、Open the database with the RESETLOGS option

第3题：

RMAN enables you to open the target database when it is already mounted. Which command must you execute at the RMAN prompt to open the database？（）

• A、’SQL ALTER DATABASE OPEN’；
• B、SQL ALTER DATABASE ’OPEN’；
• C、OPEN DATABASE；
• D、DATABASE OPEN

第4题：

After the recovery is complete， which command should you execute？（）

• A、ALTER DATABASE OPEN；
• B、ALTER DATABASE CLEAR LOGFILE；
• C、ALTER DATABASE OPEN RESETLOGS；
• D、ALTER DATABASE OPEN NORESETLOGS；

第5题：

You work as a database administrator for Supportcenter.cn. You started the instance using theinit.orafile. You have two control files and three redo log groups in your database. You decided to protect the database against failures by adding one more control file. Which file is the appropriate way to perform this task？（）

• A、Shut down the instance， copy the control file to the third location and open the database.
• B、Abort the instance， copy the control file to the third location， modify the CONTROL_FILES parameter in theinit.orafile and open the database.
• C、Copy the control file to the third location， modify the CONTROL_FILES parameter in theinit.orafile， restart the instance and open the database.
• D、Shut down the instance， copy the control file to the third location， modify the CONTROL_FILES parameter in theinit.orafile and open the database.
• E、Shut down the instance， startup in the mount state， copy the control file to the third location， modify the CONTROL_FILES parameter ininit.oraand open the database.

第6题：

You work as a database administrator for Certkiller .com. Your database is in the MOUNT state and you execute the following command to open it ALTER DATABASE OPEN； What two actions are performed as a result of this command？（）

• A、All control files are opened
• B、All redo files are opened
• C、The password file is opened
• D、The parameter file is opened
• E、All online data files are opened

第7题：

After performing a clean shut down of the database instance for maintenance， you mount thedatabase and then 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8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9题：

You work as a database administrator for Certkiller .com. The database is open. A media failure has occurred， resulting in loss of all the control files in your database. Which statement regarding the database instance is true in this scenario？（）

• A、The instance would hang.
• B、The instance needs to be shut down.
• C、The instance would be in the open state.
• D、The instance would abort in such cases.
• E、The instance would be in the open and invalid state.
• F、The instance would in the open state， but all the background processes will be restarted.

第10题：

our database is in the MOUNT state and you execute the following command to open it：  ALTER DATABASE OPEN  What two actions are performed as a result of this command？（）

• A、All control files are opened.
• B、All redo log files are opened
• C、The password file is opened.
• D、The parameter file is opened.
• E、All online data files are opened.