Abstract :
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Reliability is defined as the probability of failure-free system operation in a specified environment for a specified period of time. It is important to assess the reliability of the critical and non-critical systems and availability of the system. Reliability models are a powerful tool for predicting, controlling, and assessing software reliability. A lot of work on standby systems has been done by various researchers in the field of reliability modeling. But the reliability modeling on primary and standby databases is yet to be reported in the literature of reliability. Our aim is too ill in such a gap. The present study deals with the study of a database system having primary database unit and hot standby database unit provided by the system provider as and whenever required When the primary database unit fails, the hot standby database unit becomes the production database and primary database unit goes under repair. As many standby unit are provided by the system provider as required by the user during the time the primary units remain operable. However when the standby unit work as the primary unit and gets failed then it is repaired and no other standby unit is provided during this time.
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