由于可以在表空间级进行备份，所以还可以进行粒度控制。
You also have granular control since you can back up at the table space level.
并发控制支持表级和行级锁。
所述WLAN的中央控制器生成针对在不同功率级下进行传送的调度表，并且每一个接入点基于该调度表改变其传传输功率级。
A central controller of the WLAN generates a schedule for transmission at different power levels, and each access point varies its transmission power level based on the schedule.
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