Which two database operations can be performed at the MOUNT stage of database startup？（）

多项选择题YourdatabaseisinNOARCHIVELOGmode.Afterwhichtwooperationsyoushouldtakethebackupofcontrolfile？（）

A.adding a new user to the database
B.dropping a user from the database
C.dropping a table from the database
D.dropping a data file from a tablespace
E.adding a new tablespace to the database

多项选择题Auserwantstoconnecttothedatabaseinstancefromanapplicationthatisrunningonaremotemachine.WhichtoolsshouldtheDBAusetoestablishtherequiredconfigurationtoensurethattheuserisabletoconnecttothedatabaseinstance？（）

A.Data Pump
B.Oracle Net Manager
C.Oracle Enterprise Manager
D.Oracle Universal Installer （OUI）
E.Database Configuration Assistant （DBCA）

单项选择题YoudefineanalerttoberaisedwhentheUSERStablespaceusagehasreached80%ofthetotalspace.Whichareawouldyoureferto，inordertoconfirmthatthealerthasbeenraisedduetheevent？（）

A.the alert.log file
B.the DBA_ALERTS view
C.the Database Control Home page
D.the Database Control performance page
E.the Database Control Maintenance page

多项选择题YourequiretheOracleservertomanagetheundosegmentsandspaceamongvariousactivesessionsautomatically.Youcreatedanundotablespace，UNDO_TBS1，inyourdatabase.Whichtwoadditionalstepswouldyouperformtoachievethis？（）

A.Set the UNDO_RETENTION parameter to 900 or more.
B.Create an initial undo segment in the undo tablespace.
C.Enable the retention guarantee for the undo tablespace.
D.Set the UNDO_TABLESPACE parameter to UNDO_TBS1.
E.Set the UNDO_MANAGEMENT initialization parameter to AUTO.

单项选择题WhatistheimplicationofsettingtheinitializationparameterFAST_START_MTTR_TARGETto0inyourdatabase？（）

A.MTTR Advisor would be disabled.
B.Redo Log Advisor would be disabled.
C.Automatic tuning of checkpoint would be disabled.
D.Checkpoint information would not be written to the alert log file.