Abstract
In this paper, two recovery techniques used to restore the integrity of the distributed database management system operating in the presence of intermittent failures and with a checkpointing and roll-back recovery scheme are analysed and compared. A mathematical model of the distributed database management system is proposed to evaluate its disponibility at the updating and interrogating operations in the case of one, two, three and four distributed copies. Numerical illustrations are presented and it is shown that the recovery procedure based on the transfert of the valid copies across the network is better in some given conditions of processing of the distributed database management system.
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