While performing monitoring and tuning the database， you want to view the summarized information about the warning level alerts and critical level alerts. Which section of the Oracle Enterprise manager displays the summarized information about the warning and critical level alerts？（）  

单项选择题Youpreviouslysecuredyourlistenerwithanencryptedpassword.However，youneedtosetanewpasswordforsecurityreasons.WhatisthecorrectmethodforsettinganewencryptedpasswordforthelistenerusingtheListenerControlutility？（）

A. executing the SET PASSWORD command and then the SAVE_CONFIG command
B. executing the CHANGE_PASSWORD command and then the SAVE_CONFIG command
C. executing the CHANGE_PASSWORD command and then the SET PASSWORD command
D. executing the SET PASSWORD command， then the CHANGE_PASSWORD command and finally， the  SAVE_CONFIG command

单项选择题Thelistenerhasshutdownunexpectedly.Youwanttoviewthelistenerlogfileandlistenertracefiletofindthecauseoftheproblem.Howcanyouviewthecontentsofthelistenerlogfileandthelistenertracefile？（）

A. Open the file at the location specified by the BACKGROUND_DUMP_DEST parameter in the pfile.
B. Open the file at the location specified by the USER_DUMP_DEST parameter in the pfile.
C. Issue the SERVICES command at the LSNRCTL> prompt.
D. Issue the STATUS command at the LSNRCTL> prompt.

单项选择题You are maintaining the database of a company. The listener process， listener1， is configured for remote access. You have issued the following command：   LSNRCTL>STATUS listener1   Which information will NOT be displayed when you issue the above command？（）

A. whether the password is set in the listener or a file or not
B. the number of client connections the service handler has refused
C. the information will be displayed whether the instance can accept connections or not
D. the protocol addresses on which the listener is configured to listen

多项选择题YouarerequiredtoremovethedefaultEXTPROCentryfromthedefaultlistenerconfigurationtocreatealistenerthatwilllistenspecificallyforEXTPROCcalls.WhichtwomethodscanyouusetoremovethedefaultEXTPROCentryfromthedefaultlistenerconfiguration？（）

A. the RMAN utility
B. the import/export utility
C. the Oracle Enterprise Manager
D. the change tracking feature
E. the Net Manager utility

单项选择题You executed the following procedure to collect statistics regarding an index：       SQL>ANALYZE INDEX EMP_ID VALIDATE STRUCTURE；   Which view will you use to determine whether you need to rebuild the index or not？（）

A. INDEX_STATS
B. DBA_INDEXES
C. DBA_IND_COLUMNS
D. V$OBJECT_USAGE