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Glossary : isolation level

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isolation level

An isolation level represents a particular locking strategy employed in the database system to improve data consistency. The higher the isolation level number, the more complex the locking strategy behind it. The isolation level provided by the database determines how a transaction handles data consistency.
The American National Standards Institute (ANSI) defines four isolation levels:
*Read uncommitted (0)
*Read committed (1)
*Repeatable read (2)
*Serializable (3)