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Java Persistence with Hibernate
book

Java Persistence with Hibernate

by Gavin King, Christian Bauer
October 2006
Intermediate to advanced content levelIntermediate to advanced
880 pages
22h 11m
English
Manning Publications
Content preview from Java Persistence with Hibernate

10.2. Controlling concurrent access

Databases (and other transactional systems) attempt to ensure transaction isolation, meaning that, from the point of view of each concurrent transaction, it appears that no other transactions are in progress. Traditionally, this has been implemented with locking. A transaction may place a lock on a particular item of data in the database, temporarily preventing access to that item by other transactions. Some modern databases such as Oracle and PostgreSQL implement transaction isolation with multiversion concurrency control (MVCC) which is generally considered more scalable. We'll discuss isolation assuming a locking model; most of our observations are also applicable to multiversion concurrency, however.

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