MongoDB实战全攻略二(分片配置,高可用集群设计实战)
注: a. 分片的collection系统会自动创建一个索引(也可用户提前创建好)b. 分片的collection只能有一个在分片key上的唯一索引,其它唯一索引不被允许
One note: a sharded collection can have only one unique index, which must exist on the shard key. No other unique indexes can exist on the collection.
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