Your database is having two control files， three redo log file groups with two members in each group. Failure of which file would cause an instance to shut down？（）

单项选择题Youhavebeenrecentlyhiredasadatabaseadministrator.YourseniormanagerasksyoutostudytheproductiondatabaseserverandsubmitareportonthesettingsdonebythepreviousDBA.Whileobservingtheserversettings，youfindthatthefollowingparameterhasbeensetintheparameterfileofthedatabase：REMOTE_OS_AUTHENT=TRUEWhatcouldhavebeenthereasontosetthisparameterasTRUE？（）

A.to enable operating system authentication for a remote client
B.to restrict the scope of administration to identical operating systems
C.to allow the start up and shut down of the database from a remote client
D.to enable the administration of the operating system from a remote client
E.to disable the administration of the operating system from a remote client

单项选择题Your database is open and users are connected using the LISTENER listener. The new DBA of the system stops the listener by using the following command：  LSNRCTL> STOP  What would happen to the sessions that are presently connected to the database instance？（）

A.The sessions are able to perform only queries.
B.The sessions are not affected and continue to function normally.
C.The active transactions are rolled back and the sessions get terminated.
D.The sessions are not allowed to perform any operations till the listener is started.

单项选择题Youcreatedaresponsefileandwanttocheckitbeforestartinginstallationsinsilentmode.YoustartedinstallationofOraclesoftwareininteractivemodebyprovidingtheresponsefile.Inthemiddleoftheinstallation，yourealizethatthebehavioroftheOracleUniversalInstaller（OUI）isnotconsistentwiththeresponsefile.Whatactionwouldyoutaketodetectthecauseofthisbehavior？（）

A.Compare the contents of the install.log file with the response file.
B.Refer to the contents of the oraInst.loc file to verify the steps performed by OUI.
C.Compare the contents of the installActions.log file with that of the response file.
D.Refer to the alert log file for information regarding the actions performed by OUI during installation.

单项选择题Youbackedupthecontrolfiletotrace.Whichstatementistrueaboutthetracefilegenerated？（）

A.The trace file is in binary format.
B.The trace file has a SQL script to re-create the control file.
C.The trace file is a backup set created during the backup of the control file. 
D.The trace file contains the instructions to manually re-create the control file.
E.The trace file is an image copy of the control file created during the backup of the control file.

单项选择题User A executes the following command to update the TRANS table）  SQL> UPDATE B.trans SET tr_amt=tr_amt+500 WHERE c_code=’C005’；  Before user A issues a COMMIT or ROLLBACK command， user B executes the following command on the TRANS table：   SQl> ALTER TABLE trans MODIFY （tr_type VARCHAR2 （3））；  What would happen in this scenario？（）

A.The transaction for user A is rolled back.
B.The ALTER TABLE command modifies the column successfully.
C.The ALTER TABLE command fails due to the resource being busy.
D.The ALTER TABLE command waits until user A ends the transaction.