不好意思也算看过好了。。。找到精髓的一句了 - The shard key is used toroute the query to a given shard, but once there, each shard itself determines whichindex to use to serve the query. Keep this in mind when designing queries andindexes for your application.这本绝对比权威指南丰富太多,推荐。12-21
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