Concurrency control in database management systems is essential for ensuring the correctness of concurrently executing transactions. ACID compliance and concurrency control protocols are crucial for managing concurrent transactions. Two-phase locking (2PL) is a widely used protocol that requires transactions to acquire locks before accessing data, while optimistic concurrency control (OCC) allows transactions to execute concurrently without restrictions, resolving conflicts only at commit time by ensuring that the final schedule remains serializable. Timestamp-based protocols and multi-version concurrency control (MVCC) are also discussed as alternatives for managing concurrent transactions. The Aerospike approach combines optimistic concurrency control for reads and strict 2PL for writes, optimizing performance while ensuring correctness through locking for concurrent writes. Understanding concurrency control is vital for maximizing database performance, and the choice of protocol depends on the specific use case and requirements.