单项选择题 Which of the following advisors within the Oracle advisory framework will analyze a single SQL statement and make recommendations for performance improvement?（）

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?（）

多项选择题 Which tasks are run automatically as part of the Automated Maintenance Task by default? （）(Choose all that apply.)