There are still some problems in concurrency control algorithms for rtdbss , such as wasted restart , wasted wait , wasted execution , unnecessary restart 然而,現有的實時事務并發控制算法依然存在浪費的重啟、浪費的等待、浪費的執行和不必要的重啟等問題。
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 、設計并開發了一個具有很好的可擴展性和可配置性的實時數據庫測試平臺來分析和比較實時事務并發控制算法的性能。
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 實時事務按照截止期和價值確定的優先級進行調度,而傳統數據庫中的并發控制并沒有考慮優先級。
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 、提出了基于提交范圍( commitspace )的occ - cs算法來實現動態調整執行順序方法,并對occ - cs算法進行了復雜度分析。
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 近年來很多研究人員致力于設計適合實時數據庫系統的并發控制算法。實時事務并發控制算法不但需要保證數據庫的一致性,同時還要盡量滿足實時事務的截止期來降低系統的錯失率。