After the space has been allocated in the row directory of a data block's overhead, this space is not reclaimed when the row is deleted.
一旦一个数据块的开销中的行目录已经被分配了空间，那么这个空间不会在这行记录删除的时候被回收利用。
After the space has been allocated in the row directory of a data block's overhead, this space is not reclaimed when the row is deleted.
一旦一个数据块的开销中的行目录已经被分配了空间，那么这个空间不会在这行记录删除的时候被回收利用。
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