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也就是说,通过添加新实例或升级实例类型,我有两个模型。那么,哪个更可取,在什么情况下应该使用哪个模型?
您的问题类似于垂直与水平可扩展性概念。这是一种权衡,最好的方法通常是两者的混合,主要取决于系统的性质。