单项选择题
A. Enable supplemental logging for the database.
B. Specify undo retention guarantee for the database
C. Create Flashback Data Archive in the tablespace where the tables are stored.
D. Create Flashback Data Archive and enable Flashback Data Archive for specific tables
多项选择题 YouhaveenabledbackupoptimizationfortheRMANenvironment.IdentifytwocriteriaonwhichRMANwillskipthefile，ifithasalreadybeenbackedup.（）
单项选择题 You want to set the following initialization parameters for your database instance： LOG_ARCHIVE_DEST_1 = ’LOCATION=/disk1/arch’ LOG_ARCHIVE_DEST_2 = ’LOCATION=/disk2/arch’ LOG_ARCHIVE_DEST_3 = ’LOACTION=/disk3/arch’ LOG_ARCHIVE_DEST_4 = ’LOCATION=/disk4/arch MANDATORY’ Identify the statement that correctly describes this setting.（）
单项选择题 Before a Flashback Table operation，you execute the following command： ALTER TABLE employees ENABLE ROW MOVEMENT； Why would you need this to be executed？（）