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Lock-based concurrency control

Lock-based concurrency control is a mechanism used in database systems and software applications to manage simultaneous access to shared resources. It serves as a foundational element of [[Transaction|transactions]], ensuring data integrity and consistency when multiple processes attempt to read or modify the same data concurrently^[600-developer__principle__transation.md].

Core Principles

The implementation of lock-based concurrency control relies on the interplay between two core concepts: Locks and Concurrency^[600-developer__principle__transation.md].

  • Locks: These are synchronization primitives used to enforce mutual exclusion on a resource. By acquiring a lock, a transaction or thread restricts access to that resource, preventing other transactions from performing conflicting operations until the lock is released^[600-developer__principle__transation.md].
  • Concurrency: This refers to the execution of multiple instruction sequences at the same time. Locking mechanisms are required to manage the overlap of these operations, ensuring that concurrent transactions do not interfere with one another or lead to an inconsistent state^[600-developer__principle__transation.md].
  • [[Transaction]]
  • [[Mutual exclusion]]
  • [[Deadlock]]

Sources

^[600-developer__principle__transation.md]