Nested transactions: an approach to reliable distributed computing
Nested transactions: an approach to reliable distributed computing
The theory of database concurrency control
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Concurrency control and recovery in database systems
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Intra-Transaction Concurrency Control and the NT/PV Model
Intra-Transaction Concurrency Control and the NT/PV Model
The nt/pv model: a new representation for long-duration transaction systems
The nt/pv model: a new representation for long-duration transaction systems
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In the typical database system, an execution is correct if it is equivalent to some serial execution. This criterion, called serializability, is unacceptable for new database applications which require long-duration transactions. We present a new transaction model which allows correctness criteria more suitable for these applications. This model combines three enhancements to the standard model: nested transactions, explicit predicates, and multiple versions. These features yield the name of the new model, nested transactions with predicates and versions, or NT/PV.The modular nature of the NT/PV model allows a straightforward representation of simple systems. It also provides a formal framework for describing complex interactions. The most complex interactions the model allows can be captured by a protocol which exploits all of the semantics available to the NT/PV model. An example of these interactions is shown in a CASE application. The example shows how a system based on the NT/PV model is superior to both standard database techniques and unrestricted systems in both correctness and performance.