EXTENTSIZE是在将数据写入到下一个容器之前写入到当前容器中的数据的页数(如果表空间中存在多个容器的话)。
EXTENTSIZE is the number of pages of data that will be written to a container before writing to the next container (if multiple containers exist in the table space).
这两个值(页数和页面大小)的乘积就是堆的当前大小。
Multiplying the two values — number of pages and the pagesize — gives the current size of the heap.
输出的 page 部分指示系统的当前分页状态；pi 列指示读入内存的页数目，而 po 列则指示移出内存的页数目。
The page section in the output indicates current paging status of your system; pi column indicates number of pages read into the memory and po column indicates number of pages paged out of the memory.
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