单项选择题
A.when performing export and import using Oracle Data Pump
B.when performing backup and recovery operations using Oracle Recovery Manager
C.when performing batch processing and bulk loading operation in a data warehouse environment
D.in an online transaction processing （OLTP） system where large number of client sessions are idle most of the time
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？（）
单项选择题 You have been recently hired as a database administrator. Your senior manager asks you to study the production database server and submit a report on the settings done by the previous DBA. While observing the server settings， you find that the following parameter has been set in the parameter file of the database： REMOTE_OS_AUTHENT = TRUE What could have been the reason to set this parameter as TRUE？（）
多项选择题 Youplantousestaticdatabaseregistrationforanewlistenerwhenyoucreateit.Whatcouldbethetworeasonsforthis？（）