Therefore, the amount of time required for any particular memory access is completely unknown (if the memory is swapped out, who knows how long it will take).
因而,某一内存访问所需的时间是完全未知的(如果内存被换出,所需时间的长短是不可知的)。
2
The export and import database took a longtime because cell1 is the largest database and during exporting and importing, the customer can not access the database.