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所以 MongoDB 3.0 以上版本也只能有 50 個副本集成員,應該是有思考過這個問題的。
3.0之前最多12個節點,3.0開始節點數量能夠達到50個。但節點數1個或者2個的時候,MongoDB 就無法發揮副本集特有的優勢,因此我們一般建議節點數大於3個。
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