You work as a database administrator for Supportcenter.cn. Your listener process， L1， is currently listening to three databases： CertK INDB04， SupportCenter DB05 and SupportCenter DB06. Using Database Configuration Assistant （DBCA） you create one more database， SupportCenter DB07， and enable dynamic registration. Which two commands of Listener Control Utility （lsnrct1） would you use to determine whether the dynamic registration occurred for the database， SupportCenter DB07， with the L1 listener process？（）

单项选择题YouworkasadatabaseadministratorforSupportcenter.cn.YouareusingRecoveryManager（RMAN）forbackupandrecoveryofyourdatabase.YouexecutedthedeletecommandinRMANtodeleteabackupofatablespace.Whichstatementistrueinthisscenario？（）

A.The backup status will be marked expired in RMAN recovery catalog.
B.The backup status will be marked deleted in RMAN recovery catalog after you execute the crosscheck command.
C.The backup will be deleted physically from the OS （Operating system）and the backup information is removed from the recovery catalogl
D.The backup status will be marked deleted and you must delete the backup file manually from the OS （Operating system）.
E.The backup status will be marked deleted and you must delete the backup file manually from the OS （Operating system）， if you are not using Oracle Managed Files （OMF）.

多项选择题YouworkasadatabaseadministratorforSupportcenter.cn.Oneofthedatabaseusersaccidentallydeletedalltherowsofacriticaltableandcommittedthedeleteat1：30p.m.Youseniordatabaseadministrator，SupportCenter，asksyoutoretrievethelostdata.Whichtwoactionswouldyouusetoensurethatthereisnoimpactonotherconnecteduserswhileretrievingthedeletedrows？（）

A.Use a flashback query to retrieve the rows that were deleted
B.Useconventialincremental export and then import the affected object
C.Shutdown the database inNORMALmode and restart the database instance
D.Use DBMS_META package to reconstruct the object using undo segments
E.UseTablespacePoint in Time Recovery （TSPITR） method to recover the table and the data
F.Use Oracle DataPumptwithflashback_timeoption toentableflashback export and then import the affected object.

单项选择题You work as a database administrator for Supportcenter.cn. When you tried to connect to the database， you received the following error：   ERROR：   ORA-12541：TNS：no_listener   You found that the listener is not running on the server， so you issued the following command in the Listener Control utility to start the listener.   lsnrctl>START   What statement is true？（）

A.It would attempt to start the default listener
B.It would start the most recently created listener.
C.It would display an error with a message asking for the listener name to be specified.
D.It would show you a list of listeners and prompts for the listener name that you want to start.

单项选择题You execute the following command in your Supportcenter.cn production database to change the width of the CUST_NAME column of the CUSTOMERS table：  ALTER TABLE customers   MODIFY （cust_nameVARCHAR2 （40））      When you execute the command， it displays the following error message：   ERROR at line 1：   ORA-00054： resource busy and acquire with NOWAIT specified   What could be the reason for the error message？（）

A.The database instance is not available.
B.The ALTER TABLE command does not have WAIT option
C.The table or a row in the table is currently locked by another user session.
D.The database instance is busy processing other user sessions commands.
E.The CUSTOMERS table has no long running query active at the time when this request is made.
F.The server process executing the ALTER TABLE command is busy with another command execution

单项选择题YourbossatSupportcenter.cnwantsyoutoclarifyOracle10g.Whichstatementregardingtheusageofredologfilesduringinstancerecoveryistrue？（）

A.Transactions are rolled back using redo log files.
B.Transactions are rolled forward using redo log files.
C.Transactions are rolled back using redo log files and archived log files.
D.Transactions are rolled forward using redo log files and rolled back using redo log files.