分散式資料庫主拷貝策略之模擬模式

Abstract

In distributed INGRES, the primary copy strategy based on two-phase locking is used to solve the concurrency control problem. To observe the behaviors of the transactions in distributed INGRES, a simulation model is proposed and a simulation is made in this paper, On the other hand, to observe how the primary copy sites for fragments influence the overall-response time for the transactions, we try to give a rough method for selecting the primary copy sites that can result in better overall-response time. The experimental results obtained from the simulation show that the primary copy sites selected by our method generate better results under low conflict ratio or long interval among transaction arrivals.