Dive into the critical world of transactions and concurrency control in enterprise systems with this comprehensive 57-minute conference talk from Devoxx. Explore the complexities of database systems, including concurrency control design choices like 2PL and MVCC, transaction isolation levels, and locking schemes. Understand data anomalies that can occur at different isolation levels, with specific examples from Oracle, SQL Server, PostgreSQL, and MySQL. Learn why database transactions alone may not suffice, especially in multi-request web flows, and discover application-level transaction patterns using both optimistic and pessimistic locking mechanisms. Gain insights into Concurrency Control strategies employed in Hibernate's second-level caching mechanism, which enhances performance without compromising strong consistency.