单项选择题
A. It improves resync operations.
B. This feature enables much faster file opens.
C. It improves performance as fewer extent pointers are needed in the shared pool.
D. It improves performance by reading from a copy of an extent closest to the node.
单项选择题 You have a very large table that your users access frequently. Which of the following advisors will recommend any indexes to improve the performance of queries against this table？（）
单项选择题 View the following SQL statements： Transaction T1 INSERT INTO hr.regions VALUES （5，’Pole’）；COMMIT； Transaction T2 UPDATE hr.regions SET region_name=’Poles’ WHERE region_id = 5； COMMIT； Transaction T3 UPDATE hr.regions SET region_name=’North and South Poles’ WHERE region_id = 5； You want to back out transaction T2. Which option would you use？（）
多项选择题 You plan to use SQL Performance Analyzer to analyze the SQL workload. You created a SQL Tuning Set as a part of the workload capturing. What information is captured as part of this process？（）