advanced~3h
MongoDB Performance Optimization — Explain Plan, Covered Queries & Pagination
explain() tells you what a query actually did rather than what you hoped it did, covered queries let you skip the document fetch entirely, and cursor-based pagination avoids the performance cliff that offset-based skip/limit hits at scale.
Learning objectives
- Read explain("executionStats") output and identify whether a query used an index effectively.
- Design a compound index that produces a covered query for a given read pattern.
- Explain why offset-based pagination degrades with depth and implement cursor-based pagination instead.
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MongoDB Performance Optimization — Explain Plan, Covered Queries & Pagination