You work as a database administrator for Supportcenter.cn. Client connection requests are failing because the listener is not responding. You want to forward client connect requests to another listener if one listener is not responding. How do you achieve this？（）

多项选择题YouworkasadatabaseadministratorforSupportcenter.cn.YourdatabaseisintheMOUNTstateandyouexecutethefollowingcommandtoopenitALTERDATABASEOPEN；Whattwoactionsareperformedasaresultofthiscommand？（）

A.All control files are opened
B.All redo files are opened
C.The password file is opened
D.The parameter file is opened
E.All online data files are opened

单项选择题YouworkasadatabaseadministratorforSupportcenter.cn.Yoususpectthatinoneofyourapplicationsthecustomertableisbeingaccessedbysomeunauthorizedusers.Whichoptionwouldyouusetomonitorthequeriesbeingexecutedonthecustomertable？（）

A.Monitor thealert.logfile
B.Enable server-side SQL tracing for user sessions
C.Enable fine-grained auditing for the customer table
D.Enable Fine-Grained Access Control （FGAC） for the customer table
E.Write a database trigger on the customer table on the SELECT event