concurrency control and recovery - meaning and definition. What is concurrency control and recovery
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What (who) is concurrency control and recovery - definition

MEASURES TO ENSURE CONCURRENT COMPUTING OPERATIONS GENERATE CORRECT RESULTS
Concurrent access; Global concurrency control; Multidatabase concurrency control; Modular concurrency control

Concurrency control         
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.
Multiversion concurrency control         
CONCURRENCY CONTROL METHOD COMMONLY USED BY DATABASE MANAGEMENT SYSTEMS
Multi-Version Concurrency Control
Multiversion concurrency control (MCC or MVCC), is a concurrency control method commonly used by database management systems to provide concurrent access to the database and in programming languages to implement transactional memory.
Multi-Version Concurrency Control         
CONCURRENCY CONTROL METHOD COMMONLY USED BY DATABASE MANAGEMENT SYSTEMS
Multi-Version Concurrency Control
<database> (MVCC) An advanced technique for improving multi-user database performance. The main difference between multiversion and lock models is that in MVCC locks acquired for querying (reading) data don't conflict with locks acquired for writing data and so reading never blocks writing and writing never blocks reading. This technique is used in the free software database PostgreSQL. (1999-06-18)

Wikipedia

Concurrency control

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.

Computer systems, both software and hardware, consist of modules, or components. Each component is designed to operate correctly, i.e., to obey or to meet certain consistency rules. When components that operate concurrently interact by messaging or by sharing accessed data (in memory or storage), a certain component's consistency may be violated by another component. The general area of concurrency control provides rules, methods, design methodologies, and theories to maintain the consistency of components operating concurrently while interacting, and thus the consistency and correctness of the whole system. Introducing concurrency control into a system means applying operation constraints which typically result in some performance reduction. Operation consistency and correctness should be achieved with as good as possible efficiency, without reducing performance below reasonable levels. Concurrency control can require significant additional complexity and overhead in a concurrent algorithm compared to the simpler sequential algorithm.

For example, a failure in concurrency control can result in data corruption from torn read or write operations.