How does DB2 implement optimistic concurrency control?
- Locking Mechanisms
- MVCC (Multi-Version Concurrency Control)
- Timestamp-based Concurrency Control
- Two-Phase Locking
DB2 implements optimistic concurrency control through MVCC (Multi-Version Concurrency Control). This mechanism allows transactions to proceed without waiting for others to complete, by maintaining multiple versions of a data item. When a transaction reads a data item, it gets a timestamp, and if another transaction updates the same data after that timestamp, the database creates a new version of the data, maintaining the older version for read consistency. MVCC reduces contention and improves concurrency in DB2 systems.
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