Which is the source used by Automatic SQL Tuning that runs as part of the AUTOTASK framework? （）
A、SQL statements that are part of the AWR baseline only
B、SQL statements based on the AWR top SQL identification
C、SQL statements that are part of the available SQL Tuning Set (STS) only
D、SQL statements that are available in the cursor cache and executed by a user other than SYS
要求长后备放电时间的蓄电池组，处于小电流放电状态时，蓄电池组的终止电压要适当提高。
A、对
B、错
柴油发电机组是用柴油机作为动力，驱动交流（）提供电能。
光缆穿越或沿靠山涧、溪流等易受水流冲刷的地段时，应根据具体情况设置（）保护措施。
A、漫水坡
B、水泥封沟
C、挡水墙
D、其他保护措施
Examine the following command: SQL> ALTER TABLE booking SHRINK SPACE COMPACT; Which activity is performed when the preceding command is executed?（）
A、The shrink operation touches every block in the BOOKING table
B、The high-water mark (HWM) for the BOOKING table is shifted from its original position
C、The progress of the shrink operation is saved in the bitmap blocks of the BOOKING table
D、The data manipulation language (DML) triggers on the BOOKING table are executed because the shrink operation is internally handled by the INSERT/DELETE operation
