Wednesday, June 26, 2013

mongoDB : Real-time Profiling a MongoDB Cluster

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In a sharded cluster of replica sets, which server or servers handle each of your queries? What about each insert, update, or command? If you know how a MongoDB cluster routes operations among its servers, you can predict how your application will scale as you add shards and add members to shards.

Operations are routed according to the type of operation, your shard key, and your read preference. Let’s set up a cluster and use the system profiler to see where each operation is run. This is an interactive, experimental way to learn how your cluster really behaves and how your architecture will scale.

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