intermediate~4h
Locking — Optimistic vs Pessimistic
Locking controls concurrent access to data to prevent anomalies. The choice between optimistic and pessimistic locking dramatically affects application design and performance.
Learning objectives
- Explain the difference between pessimistic and optimistic locking in terms of when the conflict is detected.
- Trace exactly what a version-number column does in an optimistic-locking UPDATE statement.
- Recognize a deadlock scenario between two transactions and explain why the database can detect it automatically.
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Locking — Optimistic vs Pessimistic