In information technology and computer science, especially in the fields of computer programming, operating systems, multiprocessors, and databases, concurrency control ensures that correct results for concurrent operations are generated, while getting those results as quickly as possible.

Concurrency mechanism using versioned data.

(software, object-oriented programming) A design pattern that deal with the multi-threaded programming paradigm.

Multiversion concurrency control (MCC or MVCC), is a non-locking concurrency control method commonly used by database management systems to provide concurrent access to the database and in programming languages to implement transactional memory.

(US) A road concurrency in which at least two numbered highway routes are signed in opposite, conflicting directions on the same stretch of physical roadway.

Optimistic concurrency control, also known as optimistic locking, is a non-locking concurrency control method applied to transactional systems such as relational database management systems and software transactional memory.