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。
A platform of network communications about mutimedia information and interfaces of the xml document processing are realized . following the xml criterions , a interactive protocal on tcp / ip is built . also , a management model of the users " power is put forward and implemented . what ' s more , a concurrency control algorithm based on node version is put forward and improved 系統實現了支持多媒體交互的網絡傳輸平臺;提出并實現了應用層消息轉發和組播算法;采用xml規范在tcp ip協議之上實現了系統的協作通信協議;提出并實現了系統的用戶和權限管理模型;實現了xml文檔處理的dom接口;提出并實現了基于版本序號的并發控制算法,并對算法進行了多方面改進;用xslt實現了課件的多樣性顯示和發布。
This paper analysis the shortage of traditional concurrency control method in multidatabase and brings froward a new concurrency control algorithm . we also bring forward a new recovery method for multidatabase : synthesis 2pc protocol , which combines many multidatabase recovery methods into one algorithm , and makes the algorithm more useful and more efficient 本文還提出了一種新的多庫系統恢復機制:綜合2pc協議,它把已有的幾種多庫系統恢復機制結合在一個算法中使用,使其更適于多庫系統的異構性,應用范圍更為廣泛,效果也更好。
This paper analyzes some key issues of cooperative editing system . and a concurrency control algorithm in a cooperative editing is introduced , which provides the stable and effective support for the cooperative editing system . it enhances flexibility , practicality and compatibility of the original cooperative editing system 本文分析研究了協同編輯器需要解決的一些關鍵問題,設計和實現了z - office中協同編輯處理模塊的并發控制算法,使協同編輯器具備了有效穩定的實時協同處理能力,并且提高了協同編輯器的靈活性、實用性和通用性。