单选题You have issued a SHUTDOWN ABORT command to bring down your database instance. Considerthe steps that will be performed later when you open the database：  1：SGA is allocated.  2：Control file is read.  3：Redo log files are read.  4：Instance recovery is 

第1题：

You have issued a SHUTDOWN ABORT command to bring down your database instance. Considerthe steps that will be performed later when you open the database：  1：SGA is allocated.  2：Control file is read.  3：Redo log files are read.  4：Instance recovery is started.  5：Background processes are started.  6：Data files are checked for consistency.  7：Server parameter file or the initialization parameter file is read. Which option has the correct order in which these steps occur（）

• A、7，1，5，2，3，6，4
• B、1，2，3，7，5，6，4
• C、7，1，4，5，2，3，6
• D、1，7，5，4，2，3，6

第2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3题：

第4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5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6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7题：

You used the IMMEDIATE option to shut down your database instance. Consider the steps that  mayoccur when a database instance is started and database is opened：  1：SGA is allocated.  2：Control file is read.  3：Redo log files are opened.  4：Instance recovery is started.  5：Background processes are started.  6：Data file headers are checked for consistency.  7：Server parameter file or the initialization parameter file is read.  Which option has the correct order in which these steps occur（）

• A、7，1，5，2，3，6，4
• B、1，5，7，2，3，6；step 4 is not required
• C、7，1，5，2，3，6；step 4 is not required
• D、1，2，3，5，6，4；step 7 is not required

第8题：

The database is running in the ARCHIVELOG mode. It has three redo log groups with one member each. One of the redo log groups has become corrupted. You have issued the following command during the recovery of a damaged redo log file：   ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP 3；   Which action should you perform immediately after using this command？（）  

• A、 You should perform a log switch
• B、 You should make a backup of the database
• C、 You should switch the database to the NONARCHIVELOG mode
• D、 You should shut down the database instance and perform a complete database recovery

第9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10题：

You are working on an instance started using the SPFILE. You want to move the Flash Recovery Areaof your database to a new location. You want the Flashback log files to be stored in the new location. Given below are the steps to accomplish the task in random order：  1）Shut down the instance.  2）Change the value of the DB_RECOVERY_FILE_DEST initialization parameter to a new value.  3）Execute the ALTER DATABASE FLASHBACK OFF command.  4）Start up the instance and mount the database.  5）Execute the ALTER DATABASE FLASHBACKON command.  6）Open the database.  Select the correct order in which these tasks need to be performed. （）

• A、2，1，4，3，5，6
• B、1，4，3，2，6，5
• C、1，4，2，6，3，5
• D、3，2，1，4，5，6