While setting up the database for your production environment， you want to create a user with following requirements.  
1.The objects created by the user must be stored in a tablespace， TBS1， if the  TABLESPACE option is not defined during the object creation.  
2.The user should be able to use 10MB of space in the tablespace TBS1.  
3.The user must change the password immediately after logging in for the first time.  
Which three options of the CREATE USER command would you use to achieve this objective？（）

单项选择题Inyourdatabase，theusersSYSandSYSTEMhavebeenassignedtheprofiles，ADMIN_PROF1andADMIN_PROF2，respectively.TherestofthedatabaseadministratorsareassignedtheprofileADMIN_PROF3.Youcreateaprofile，USER_PROF，andassignittotheapplicationuser，Adams.Afteraweekyourealizethattheprofileisnolongerrequiredandyoudecidetodropit.WhatwillAdam’sprofilebeaftertheUSER_PROFprofilehasbeendropped？（）

A.no profiles
B.the default profile
C.same as the profile of SYS user
D.same as the profile of SYSTEM user

单项选择题You are connecting to an Oracle database server from a client by using the following connect string：   SQL> CONNECT hr hr@pdserver.us.oracle.com：1521 proddb   Which naming method is being used in this case？（）

A.Local Naming
B.Easy Connect
C.External Naming
D.Directory Naming

单项选择题YouworkasadatabaseadministratorforSupportcenter.cn.Youreceivedthefollowingerrorwhileworkingonyourdatabase：ORA-01555：snapshottooold，Inwhichsituationwouldyoureceivesuchanerror？（）

A.You performed rollback after commit.
B.If a log switch occurs in your database.
C.Thearchiverfails to generate an archived log file.
D.Instance recovery fails to find one of the redo log files.
E.A long-running query is unable to get read-consistent image.
F.If you perform manual undo management operations in auto mode.

单项选择题YouworkasadatabaseadministratorforSupportcenter.cn.Youaddedatablespacetoyourdatabase.Becauseofthechangestothephysicalstructureofyourdatabase，youperformedabackupofthecontrolfiletotrace.Afterthis，youlostonlythecontrolfilesandtheinstanceabortedduetoahardwarefailure.Howwouldyouproceedtorecoverthedatabase？（）

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.

单项选择题YouworkasadatabaseadministratorforSupportcenter.cn.Clientconnectionrequestsarefailingbecausethelistenerisnotresponding.Youwanttoforwardclientconnectrequeststoanotherlistenerifonelistenerisnotresponding.Howdoyouachievethis？（）

A.Enable instance failover
B.Configure shared server
C.Enable database failover
D.Enable connect-time failover
E.Enable Transparent Application Failover （TAF）