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MongoDB uses ________ logging to an on-disk journal.

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MongoDB uses ________ logging to an on-disk journal.

(a) write ahead

(b) read ahead

(c) write once

(d) read only

I got this question in an interview for job.

The question is from Production MongoDB in chapter Monitoring MongoDB and Optimization Strategies for MongoDB of MongoDB

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Correct option is (a) write ahead

To explain: Leave journaling enabled in order to ensure that mongod will be able to recover its data files and keep the data files in a valid state following a crash.

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