Answer / cp

Multiversion concurrency control (abbreviated MCC or MVCC),
in the database field of computer science, is a concurrency
control method commonly used by database management systems
to provide concurrent access to the database.
MVCC provides each user connected to the database with a
"snapshot" of the database for that person to work with. Any
changes made will not be seen by other users of the database
until the transaction has been committed.

Answer / amith

Each row has two additional columns associated with it -
creation time and deletion time, but instead of storing
timestamps, MySQL stores version numbers

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