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升序片键和随机片键有什么区别?mongodb架构中该如何选择?
升序是指的1,2,3……这样的序列吗?因为默认的_id使用ObjectId其实也是升序的。前者在分布式环境中维护会非常低效,因此通常不建议使用。事实上价格递增的字段都是不适合用作片键的,这在
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