【摘要】 传统乐观并发控制方法对工程设计事务支持较弱。该文以嵌套事务模型为基础并结合检入／检出机制，提出一种改进的乐观并发控制方法，能够较好地解决传统乐观并发控制方法在工程设计事务应用上存在的问题并提高了事务的并发度。更多还原

【Abstract】 For the requirements of engineering design transaction, we present an improving optimistic concurrency control method which is based on the nested transaction model. This method extents classical optimistic concurrency control method and combines with check out/ check in mechanism, it can reslove the problems of the classical optimistic concurrency control method on engineering design transaction and improve the concurrency degree of transaction.更多还原