单项选择题
A. Create two custom ADDM tasks.
B. Modify the AWR snapshot time interval to two hours.
C. Create a new scheduler window for a time period of two hours.
D. Modify the Automatic Workload Repository （AWR） snapshot retention period to two hours.
多项选择题 The EMP table exists in your schema. You want to execute the following query： SELECT ename， sal FROM emp AS OF TIMESTAMP （SYSTIMESTAMP - INTERVAL ’6’ MINUTE） WHERE ename = ’ALLEN’； What are the minimum requirements for the statement to execute successfully？（）
单项选择题 You have three temporary tablespace groups named G1， G2， and G3 in your database. You are creating a new temporary tablespace as follows： CREATE TEMPORARY TABLESPACE TEMP1 TEMPFILE ’/u1/data/temp1.dbf’ SIZE 10M TABLESPACE GROUP ； Which statement regarding the above command is correct？（）
多项选择题 OnwhichtwodatabaseobjectscantheVERSIONSclauseoftheFlashbackVersionsQuerybeused？（）