一个分区的cpu利用率，以物理处理器的数量为单位。
A partition's CPU utilization in the units of number of physical processors.
DurationLabel：如果分区键列的数据类型是日期、时间或时间戳，这个参数指定与Constan t值相关的时间单位。
DurationLabel: Identifies the duration that is associated with the Constant value specified if the partitioning key column has been assigned a date, time, or time stamp data type.
如果您指定以兆字节或更大字节为单位的分区大小，然后接受随后分区的默认值，随后的分区可能会被对齐，但这不一定。
Proper alignment is likely to follow if you specify partition size in units of megabytes or larger and then accept the default value for subsequent partitions, but this isn't guaranteed.
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