MongoDB / Intermediate: aggregation and application contracts

MongoDB β€” Intermediate: aggregation and application contracts

Coordinate reporting, indexes, validation, drivers and transactions.

6 lessons Β· No account required

What you will learn

  • Predict pipeline grain and index/validator behavior.
  • Design compatible clients and retry-safe transaction boundaries.

  1. Aggregation stages and grouped reports

    Transform documents through explicit stages and preserve the meaning of counts and totals. Separate filtering, grouping, projection and final ordering.

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  2. $lookup, $unwind and report cardinality

    Join document collections without losing optional parents or inflating totals. Explain matched arrays, array expansion and bounded lookup design.

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  3. Compound, multikey and unique indexes

    Design indexes around actual predicates and sorting while understanding arrays, uniqueness and expiry limits. Balance lookup gains against mutation and storage costs.

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  4. Schema validation and safe evolution

    Use explicit BSON-aware validation while evolving mixed document versions safely. Separate new-write enforcement from inventorying and migrating existing data.

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  5. Drivers, connections and security boundaries

    Use supported clients with bounded pools, explicit identity and transport protection. Distinguish Atlas network admission from database authentication and authorization.

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  6. Sessions and multi-document transactions

    Choose between single-document atomicity and supported transactions. Define read/write concern, callback retries and external side-effect boundaries explicitly.

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