There are still some problems in concurrency control algorithms for rtdbss , such as wasted restart , wasted wait , wasted execution , unnecessary restart 然而,现有的实时事务并发控制算法依然存在浪费的重启、浪费的等待、浪费的执行和不必要的重启等问题。
Finally , a real - time database test platform which is extensible and configurable is designed and developed to analysis and compare the concurrency control algorithms for rtdbss 5 、设计并开发了一个具有很好的可扩展性和可配置性的实时数据库测试平台来分析和比较实时事务并发控制算法的性能。
The transactions are scheduled by their priorities assigned according to their deadlines and values , but the concurrency control algorithms for traditional database systems are not priority - cognizant 实时事务按照截止期和价值确定的优先级进行调度,而传统数据库中的并发控制并没有考虑优先级。
Third , a new optimistic concurrency control algorithm based on dynamic adjustment of execution order using commit space in rtdbss , called occ - cs , is introduced and the complexity of this algorithm is analyzed 3 、提出了基于提交范围( commitspace )的occ - cs算法来实现动态调整执行顺序方法,并对occ - cs算法进行了复杂度分析。
In recent years , many researches have been devoted to designing appropriate concurrency control algorithms for rtdbss , which need not only satisfy consistency requirements but also meet transaction timing constraints as much as possible to minimize the percentage of late transactions 近年来很多研究人员致力于设计适合实时数据库系统的并发控制算法。实时事务并发控制算法不但需要保证数据库的一致性,同时还要尽量满足实时事务的截止期来降低系统的错失率。