Respollse Time Analysis for Computer Database recorganisation with Concurrent Usage and Chmgeover State

摘要

An online information system may require reorganisation after continuous usage for sometime. In this paper the performance of a database is modelled when reorganisation is performed concurrently with usage in an essentially computer utility environment. A twopriorify queueing model is considered with activity by users having higher priority and database reorganisation having low priority. In the absence of any user the system goes to changeover state for an arbitrary length of time and if a user arrives, it immediately attends tg it otherwise it takes up reorganisation service. Steady-state equations for the model have been solved and the variatians in response time are predicted quantitatively through numerical results.