单项选择题 Your system has been upgraded from Oracle Database 10g to Oracle Database 11g. You imported SQL Tuning Sets (STS) from the previous version. After changing the OPTIMIZER_FEATURE_ENABLE parameter to 10.2.0.4 and running the SQL Performance Analyzer, you observed performance regression for a few SQL statements. What would you do with these SQL statements?（）

多项选择题 What recommendations does the SQL Access Advisor provide for optimizing SQL queries?（）

单项选择题 You plan to use Flashback Drop feature to recover a dropped table SALES_EMP. No other table with the same name exists in the schema.You query RECYCLEBIN and find multiple entries for the SALES_EMP table as follows, You then issue the following statement to recover the table: SQL> FLASHBACK TABLE sales_emp TO BEFORE DROP; What would be the outcome of the precedent statement?（）