单项选择题
A.4， 1， 3， 2， 5
B.1， 3， 4， 5， 2
C.1， 3， 2， 5； 4 not required
D.4， 1， 5， 2； 3 not required
E.1， 3， 4， 5； 2 not required
单项选择题 WhichstatementistrueabouttheUNDO_RETENTIONparameterwhenretentionguaranteeisnotenabled（）
单项选择题 View the Exhibit and examine the undo tablespace attributes. Your database instance is experiencing a largevolume of transactions from non-DBA users in the last one hour. The undo tablespace UNDOTBS1 is full withtransactions and no transaction was committed more than one hour ago. The database has two more undotablespaces. What happens to the new DML operations in this scenario（）
单项选择题 You want to access employee details contained in flat files as part of the EMPLOYEE table. You plan to add anew column to the EMPLOYEE table to achieve this. Which data type would you use for the new column（）