Multiversion Concurrency Control
Multiversion Concurrency Control:
Multiversion schemes keep old versions of data item to increase concurrency.
Multiversion 2 phase locking:
Each successful write results in the creation of a new version of the data item written. Timestamps are used to label the versions. When a read(X) operation is issued, select an appropriate version of X based on the timestamp of the transaction.
Labels: Data Base Management System, DBMS Unit-5
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