Abstract

Database applications that require time constrained response to transactions are becoming quite common. Network Services Databases[10] and Stock market applications are typical applications of real-time database systems(RTDBS). Real-time transactions are the basic unit of work for RTDBS and transactions with deadlines are categorized into hard soft and firm real-time transactions[8, 9, 12, 13]. Soft real-time transactions have time constraints, but there may be still some residual benefit for completing transactions past their deadlines. Firm real-time transactions are those which should not be considered once their deadlines are not met, as it is worthless to complete the transactions after their deadlines. So, in contrast to the soft real-time transactions, firm real-time transactions have a high possibility of abort.

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