Concurrency control and recovery in database systems
Concurrency control and recovery in database systems
SIGMOD '87 Proceedings of the 1987 ACM SIGMOD international conference on Management of data
Distributed programming in Argus
Communications of the ACM
A formal approach to recovery by compensating transactions
Proceedings of the sixteenth international conference on Very large databases
Database transaction models for advanced applications
Concepts and applications of multilevel transactions and open nested transactions
Database transaction models for advanced applications
Java database programming
Transaction Processing: Concepts and Techniques
Transaction Processing: Concepts and Techniques
Advanced Transaction Models in Workflow Contexts
ICDE '96 Proceedings of the Twelfth International Conference on Data Engineering
Notes on Data Base Operating Systems
Operating Systems, An Advanced Course
Transaction Concepts in Connection Management Applications
TINA '97 Proceedings of the Global Convergence of Telecommunications and Distributed Object Computing
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The two-phase commit protocol is combined with the strict two-phase locking protocol as means for ensuring atomicity and serializability of transactions. The implication of this combination on the length of time a transaction may holding locks on various data items might be severe. There are certain classes of applications where it is known that resources acquired within a transaction can be "released early", rather than having to wait until the transaction terminates. Furthermore, there are applications involving heterogeneous competing business organizations, which do not allow to block their resources; therefore, the preservation of local autonomy of individual systems is crucial. This paper describes an extension of the OMG's Object Transaction Service, by adding the "open nested transaction model", which greatly improves transaction parallelism by releasing the nested transaction locks at the nested transaction commit time. Open nested transactions relax the isolation property by allowing the effects of the committed nested transaction to be visible to concurrent transactions. We also describe how we take benefit of this model using the proposed Asynchronous Nested Transaction model to overcome the limits of the current messaging products and standard specifications when they are confronted with the problem of guaranteeing the atomicity of distributed multi-tier transactional applications.