任何重大更改都应推迟到该解决方案的下一代，以保持其稳定性。
Any significant changes should be deferred to a future generation of the solution to maintain its stability.
对代码进行重大更改总是一个苦差事而且是一个易出错的过程。
Making massive changes to code is always a drudgery and an error-prone process.
当对数据量或数据内容进行重大更改时，定期运行RUNSTATS。
Periodically run RUNSTATS when significant change to data volumes or data content occurs.
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