Answer / Pretam

The covered query is an optimization technique in MongoDB that allows queries to reuse already fetched data, reducing the number of times collections need to be read from disk. It's particularly useful for queries with compound indexes where only a subset of the indexed fields are used in the query.nWhen a covered query is executed, the database checks if the required information can be found entirely within the index without needing to access the collection data. If possible, it returns only the requested data from the index instead of reading the entire document.

Why do we use mongodb?

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How to connect to mongodb using mongoose in node.js?

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What is bson and how can restore this file in mongodb?

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Can you lock more than one database at the same time in mongodb?

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What is the need to provide size option on create collection?

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What are alternatives to mongodb?

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How do I connect to mongodb remotely?

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Why does profiler use in mongodb?

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Is mongodb good for storing images?

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What is the symbol of logical OR operation in mongodb?

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What is the basic syntax to use index in mongodb?

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Does an update fsync to disk immediately?

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