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？（）

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.

多项选择题YouworkasadatabaseadministratorforSupportcenter.cn.YouareusingRecoveryManager（RMAN）toperformbackupsinyourdatabases.WhichfourbackupoperationscanbeperformedusingRMAN？（）

A.A backup of the target database when it is mounted
B.A backup of online redo log files when the database is open
C.A backup of only used data blocks in the file beingbeingbackup up
D.A backup of online， read/write data files when the database is open
E.A backup of only those data blocks that have changed since a previous backup
F.A backup of online， read/write data files when the database is in the NOMOUNT state.

多项选择题YouworkasadatabaseadministratorforSupportcenter.cn.Youwanttoadministeryourdatabaseservers，whicharerunningondifferenthostmachines，usingtheWeb-enabledgridcontrolinterface.Youhaveconfiguredtheagentonthehostmachines.YouhavestartedtheOracleDatabase10gGridControlutilityonyourmachine.Whichtwoadditionalcomponentswouldyouconfiguretoachievethisobjective？（）

A.Application Server Control
B.Oracle Management Service
C.Oracle Enterprise Manager Repository
D.Oracle Enterprise Manager Database Control

单项选择题YouworkasadatabaseadministratorforSupportcenter.cn.Youwanttoconfiguredatabasebackupstoberunautomatically.Whichtoolorutilitywouldyouusetoachievethis？（）

A.The DBMS_JOB package
B.The BACKUP_JOB package
C.The DBMS_BACKUP_RESTORE package
D.The calendar tool in the Operating System （OS）
E.The backup scheduler in Enterprise Manager （EM）
F.The DBMS_BACKUP_SCHEDULER packager inline mode