Locking is a mechanism that ensures data consistency and integrity in SQL databases. However, locking can also affect query performance and concurrency, depending on the level and type of locks used.

In this session, you will learn how locks are placed at the row, page, or table level, and how the Locking Manager decides when to escalate locks to prevent excessive locking overhead. You will also see examples of shared and exclusive locks, and how they affect concurrent transactions. By the end of this session, you will be able to identify and avoid common locking problems, and optimize your queries for better performance and scalability.