您可能见到过大整数质因数分解，或是对复杂数据结构的庞大列表进行分类，这些都是长时间运行的操作。

You might see examples of prime factorizations of large integers, or sorting huge lists of complex data structures, and those are certainly long running operations.

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随着时间的推移，因数据的改变，旧的分区键有可能会不如之前那么好。

It is also possible that over time, as your data changes, old partitioning keys become less optimal than they were previously.

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