单项选择题
Which two operations can be flashed back using the Flashback technology？ （）
A.DROP USER SMITH；
B.DROP TABLE EMPLOYEES；
C.DROP TABLESPACE USERS；
D.ALTER TABLE SALES_REP DROP PARTITION P1；
E.ALTER TABLE EMPLOYEES DROP COLUMN DESIG_ID；
相关考题
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单项选择题
Yourdatabaseishavingtwocontrolfiles，threeredologfilegroupswithtwomembersineachgroup.Failureofwhichfilewouldcauseaninstancetoshutdown？（）
A.any control file
B.any archive log file
C.one of the redo log members
D.loss of the initialization parameter file
E.any data file belonging to the default permanent tablespac -
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.
