Answer / Akash Jha

A covered query in MongoDB is a query where the database can return the requested results without needing to access the original documents. This occurs when the response contains only indexed fields. Covered queries are beneficial as they reduce disk I/O, improving query performance.

What is replication in mongodb?

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What are the uses of mongodb? Explain

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How much memory does mongodb need?

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Is mongodb distributed database?

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What is morphia mongodb?

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Write the syntax for creating a collection and dropping a collection in mongodb.

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How do you see the locking status in mongo instances?

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Can you create an index on an array field in mongodb? If yes, what happens in this case?

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how to do transactions/locking in mongodb?

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Which are the storage engines used by mongodb?

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What is mongodb in big data?

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If a ‘movechunk’ fails, is it necessary to cleanup the partially moved docs?

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