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What are compound indexes in MongoDB?

Compound indexes contain multiple fields in a single index. They improve performance for queries that filter or sort using multiple fields. The order of fields in compound indexes affects how MongoDB uses them.

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What is MongoDB and why is it used?

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What is the difference between SQL and MongoDB?

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What are Collections and Documents in MongoDB?

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Jeevan Bhargav

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This answer is calibrated for technical interviews. Verify benchmarks in local sandboxes before deploying.