What should we monitor?

By far the most important metric to monitor in MongoDB is memory usage. MongoDB (and every database system for what it's worth) uses system memory extensively to increase performance. No matter if we use MMAPv1 or WiredTiger storage, used memory is the first thing we should keep our eyes on.

Understanding how computer memory works can help us evaluate metrics from our monitoring system. These are the most important concepts related to computer memory.

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