单项选择题
A. ALTER DATABASE ENABLE BLOCK CHANGE TRACKING
B. ALTER SYSTEM ENABLE BLOCK CHANGE TRACKING USING FILE
C. ALTER DATABASE ENABLE BLOCK CHANGE TRACKING USING FILE
D. ALTER SYSTEM ENABLE BLOCK CHANGE TRACKING
单项选择题 WhichstatementistruewhenAutomaticWorkloadRepository（AWR）baselinesarecreatedusingbaselinetemplates？（）
单项选择题 Whichbackgroundprocessofadatabaseinstance，usingAutomaticStorageManagement（ASM），connectsasaforegroundprocessintotheASMinstance？（）
单项选择题 You discover that your Recycle Bin contains two tables with the same name， MY_TABLE. You also have a table named MY_TABLE in your schema. You execute the following statement： FLASHBACK TABLE my_table TO BEFORE DROP RENAME TO my_table2； What will be the result of executing this statement？（）