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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
Multi-Version Concurrency Control
MVCC
(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)