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With the _______ storage engine, MongoDB uses memory-mapped files to store data.

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With the _______ storage engine, MongoDB uses memory-mapped files to store data.

(a) MMAPv2

(b) MMAPv1

(c) WiredTiger

(d) All of the mentioned

The question was asked during an online interview.

The doubt is from Optimization Strategies topic in portion Monitoring MongoDB and Optimization Strategies for MongoDB of MongoDB

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Right option is (b) MMAPv1

For explanation: Given a data set of sufficient size, the mongod process will allocate all available memory on the system for its use.

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