一种适于对象-关系数据库的事务模型

A transaction model for object-relational database

对象 关系数据库往往需要处理长时间运行的事务 ,这使得传统的事务模型不再适合于对象 关系数据库 .为此讨论了结合嵌套事务、显式谓词和多版本模型优点的QT/WD模型 ,形式化地描述了模型的结构和正确性 .嵌套事务使用了多级事务框架 ,提供了事务的多级原子性 ,显式谓词有助于增加事务之间的合作 ,多版本使限制谓词可以更容易满足而增加了并发 ,这些新特性使得QT/WD模型非常适合于长事务处理 。

In this paper a new transaction model is discussed, combining three enhancements with the traditional transaction model: nested transactions, explicit predicates and multiple versions. The formal structure and correctness classes are presented. Nested transactions provide multiple levels of atomicity based on the multilevel transaction frameworks. Explicit predicates aid cooperations among subtransactions. Multiple versions make it possible that the constraint predicates can be easily satisfied and increase concurrency. The model is an appropriate framework for solving long duration transaction and increases the performance of the system.