Multi-Version Concurrency Control

Multi-Version Concurrency Control

(database)(MVCC) An advanced technique for improvingmulti-user database performance.

The main difference between multiversion and lock models isthat in MVCC locks acquired for querying (reading) data don'tconflict with locks acquired for writing data and so readingnever blocks writing and writing never blocks reading.

This technique is used in the free software databasePostgreSQL.