如果某些工作单元控制着其他移动程序块，那么能够方便地连动撤销对它们的请求。
If some unit of work controls various other moving pieces, it should be able to conveniently chain cancellation requests to them.
第一个分配程序是通用分配，可以满足针对任何数量的连续内存块的请求。
The first is a general-purpose allocation and can serve requests for any number of contiguous chunks.
当第一个块被取尽之后，应用程序可以立即得到预取的第二个块中的行，并接着请求下一个块。
Once the first block is exhausted, the application is immediately given the rows from the second block that were pre-fetched as DB2 Connect moved ahead and requests the next block.
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