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The ________ collection stores a document for each change to the metadata of a sharded collection.

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The ________ collection stores a document for each change to the metadata of a sharded collection.

(a) version

(b) changelog

(c) settings

(d) all of the mentioned

The question was posed to me by my college professor while I was bunking the class.

My doubt stems from Cluster Deployment in chapter Sharding Concepts, Mechanics and Sharded Cluster of MongoDB

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Right answer is (b) changelog

For explanation: The config database is internal: applications and administrators should not modify or depend upon its content in the course of normal operation.

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