[单选] 在使用坡口机时，要使（）同心。

当建筑物高度相同、面积相同时，耗热量比值最小的平面形式是（）。 正方形。 长方形。 圆形。 L形。 A number of applications issue the following SQL statement:SELECT d.deptno, e.empno, e.salary FROM department d INNER JOIN employee e ON d.deptno = e.deptnoA database administrator wishes to store this query within the database. Which of the following database objects can be used to accomplish this?（） Alias。 View。 Schema。 Trigger。 Examine the following command used to perform incremental level 0 backup: RMAN> BACKUP INCREMENTAL LEVEL 0 DATABASE; To enable the block change tracking, after the incremental level 0 backup you issued the following command: SQL> ALTER DATABASE ENABLE BLOCK CHANGE TRACKING USING FILE '/mydir/ rman_change_track.f'; To perform incremental level 1 cumulative backup, you issued the following command: RMAN> BACKUP INCREMENTAL LEVEL 1 CUMULATIVE DATABASE; Which two statements are true in the above situation?（） The block change tracking data will be used only from the next incremental 0 backup.。 The incremental backup will use change tracking data for accomplishing the backup.。 The incremental backup will not use change tracking data for accomplishing the backup.。 The block track file will scan all the blocks and create bitmap for all the blocks backed up in the level 0 backup.。 DS5000系列支持超过16TB的逻辑卷。 Which command will remove the ‘stale’ status from a logical volume?（） syncvg -p。 syncvg -l。 synclv -p。 synclv -l。 在使用坡口机时，要使（）同心。