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为什么索引等相同下,数据量到达一定量级时候， 会听说 mongodb 比 mysql 快.
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MySQL - @cs8814336 - 一直没理解为什么当数据量达到一定程度时，mysql 会很慢，mongodb 会更快．以至于我到现在还没理解什么时候用 mongodb，什么时候用 mysql，不清楚两者的优势(底层原理优势).
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