多项选择题
A.Use a flashback query to retrieve the rows that were deleted
B.Useconventialincremental export and then import the affected object
C.Shutdown the database inNORMALmode and restart the database instance
D.Use DBMS_META package to reconstruct the object using undo segments
E.UseTablespacePoint in Time Recovery （TSPITR） method to recover the table and the data
F.Use Oracle DataPumptwithflashback_timeoption toentableflashback export and then import the affected object.
单项选择题 You work as a database administrator for Supportcenter.cn. When you tried to connect to the database， you received the following error： ERROR： ORA-12541：TNS：no_listener You found that the listener is not running on the server， so you issued the following command in the Listener Control utility to start the listener. lsnrctl>START What statement is true？（）
单项选择题 You execute the following command in your Supportcenter.cn production database to change the width of the CUST_NAME column of the CUSTOMERS table： ALTER TABLE customers MODIFY （cust_nameVARCHAR2 （40）） / When you execute the command， it displays the following error message： ERROR at line 1： ORA-00054： resource busy and acquire with NOWAIT specified What could be the reason for the error message？（）
单项选择题 YourbossatSupportcenter.cnwantsyoutoclarifyOracle10g.Whichstatementregardingtheusageofredologfilesduringinstancerecoveryistrue？（）