Transactions and Concurrency Control

This lecture covers the concepts of transactions and concurrency control in databases. It starts with two-phase locking and timestamp ordering as pessimistic and optimistic approaches. The Kung-Robinson Model is explained, focusing on validation and conflict resolution. Various tests for conflict detection are discussed, along with examples of optimistic concurrency control. The lecture delves into timestamp-based concurrency control, continuous validation, and multiversion concurrency control to ensure transaction consistency and avoid conflicts. It also addresses bottlenecks, performance improvement strategies, and snapshot isolation in database systems, highlighting the trade-offs and challenges in maintaining data consistency.