Many realtime applications are inheretly distributed. As developing in centralizied realtime database systems and mature of distributed database system,distributed realtime database systems have been a new hot point. ...Many realtime applications are inheretly distributed. As developing in centralizied realtime database systems and mature of distributed database system,distributed realtime database systems have been a new hot point. This paper focuses on the distributed transactions processing, which is the key problem in DRTDBS,and gives some possible approaches,in order to provide some advice for future research.展开更多
With the advances in mobile computing technology,there is an increasing demand for processing real-timetransactions in a mobile environment. This paper proposes a multi-version data model. Based on this data model, we...With the advances in mobile computing technology,there is an increasing demand for processing real-timetransactions in a mobile environment. This paper proposes a multi-version data model. Based on this data model, wepresent a relative timing correctness criterion for real-time transactions in a mobile environment. As long as the datastaleness is in a controlled extent,it is unnecessary for all the accessed data are valid when a real-time transactioncommits. Also this paper gives a transaction execution model based on the image transaction concept. All these strate-gies not only decreas the cost for the transaction concurrency control,but also increase the possibility to meet mobilereal-time transactions' deadlines by sacrificing the relatively transaction timing correctness. This is in accordance withthe real-time transaction property that a relatively correct and in-time result is more preferable than an absolutely cor-rect but obsolete result.展开更多
文摘Many realtime applications are inheretly distributed. As developing in centralizied realtime database systems and mature of distributed database system,distributed realtime database systems have been a new hot point. This paper focuses on the distributed transactions processing, which is the key problem in DRTDBS,and gives some possible approaches,in order to provide some advice for future research.
文摘With the advances in mobile computing technology,there is an increasing demand for processing real-timetransactions in a mobile environment. This paper proposes a multi-version data model. Based on this data model, wepresent a relative timing correctness criterion for real-time transactions in a mobile environment. As long as the datastaleness is in a controlled extent,it is unnecessary for all the accessed data are valid when a real-time transactioncommits. Also this paper gives a transaction execution model based on the image transaction concept. All these strate-gies not only decreas the cost for the transaction concurrency control,but also increase the possibility to meet mobilereal-time transactions' deadlines by sacrificing the relatively transaction timing correctness. This is in accordance withthe real-time transaction property that a relatively correct and in-time result is more preferable than an absolutely cor-rect but obsolete result.
