There are still some problems in concurrency control algorithms for rtdbss , such as wasted restart , wasted wait , wasted execution , unnecessary restart 然而,現(xiàn)有的實(shí)時(shí)事務(wù)并發(fā)控制算法依然存在浪費(fèi)的重啟、浪費(fèi)的等待、浪費(fèi)的執(zhí)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(shè)計(jì)并開發(fā)了一個(gè)具有很好的可擴(kuò)展性和可配置性的實(shí)時(shí)數(shù)據(jù)庫測(cè)試平臺(tái)來分析和比較實(shí)時(shí)事務(wù)并發(fā)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(shí)時(shí)事務(wù)按照截止期和價(jià)值確定的優(yōu)先級(jí)進(jìn)行調(diào)度,而傳統(tǒng)數(shù)據(jù)庫中的并發(fā)控制并沒有考慮優(yōu)先級(jí)。
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(shí)現(xiàn)動(dòng)態(tài)調(diào)整執(zhí)行順序方法,并對(duì)occ - cs算法進(jìn)行了復(fù)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(shè)計(jì)適合實(shí)時(shí)數(shù)據(jù)庫系統(tǒng)的并發(fā)控制算法。實(shí)時(shí)事務(wù)并發(fā)控制算法不但需要保證數(shù)據(jù)庫的一致性,同時(shí)還要盡量滿足實(shí)時(shí)事務(wù)的截止期來降低系統(tǒng)的錯(cuò)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(tǒng)實(shí)現(xiàn)了支持多媒體交互的網(wǎng)絡(luò)傳輸平臺(tái);提出并實(shí)現(xiàn)了應(yīng)用層消息轉(zhuǎn)發(fā)和組播算法;采用xml規(guī)范在tcp ip協(xié)議之上實(shí)現(xiàn)了系統(tǒng)的協(xié)作通信協(xié)議;提出并實(shí)現(xiàn)了系統(tǒng)的用戶和權(quán)限管理模型;實(shí)現(xiàn)了xml文檔處理的dom接口;提出并實(shí)現(xiàn)了基于版本序號(hào)的并發(fā)控制算法,并對(duì)算法進(jìn)行了多方面改進(jìn);用xslt實(shí)現(xiàn)了課件的多樣性顯示和發(fā)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(tǒng)恢復(fù)機(jī)制:綜合2pc協(xié)議,它把已有的幾種多庫系統(tǒng)恢復(fù)機(jī)制結(jié)合在一個(gè)算法中使用,使其更適于多庫系統(tǒng)的異構(gòu)性,應(yīng)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(xié)同編輯器需要解決的一些關(guān)鍵問題,設(shè)計(jì)和實(shí)現(xiàn)了z - office中協(xié)同編輯處理模塊的并發(fā)控制算法,使協(xié)同編輯器具備了有效穩(wěn)定的實(shí)時(shí)協(xié)同處理能力,并且提高了協(xié)同編輯器的靈活性、實(shí)用性和通用性。