MongoDB Transactions and Consistency

Transaction and consistency guidance for MongoDB, maintained by MongoDB. Contains 20 rules across 5 categories, prioritized by correctness risk. This skill is intentionally non-overlapping with schema and query/index skills: it focuses on atomicity, isolation, durability, retries, and consistency semantics.

When to Apply

Reference these guidelines when:

• Implementing multi-document writes that must succeed or fail together
• Choosing read concern / write concern for correctness guarantees
• Handling transaction retry errors in application code
• Diagnosing commit uncertainty and rollback risk
• Running transactions on replica sets or sharded clusters
• Designing idempotent business workflows with retries
• Reviewing whether a workload actually needs a transaction

Non-Overlap Boundaries