Optimal policies for a database system with two backup schemes

Qian, Cunhua; Pan, Yu; Nakagawa, Toshio

doi:10.1051/ro:2003004

Qian, Cunhua ; Pan, Yu ; Nakagawa, Toshio ¹

¹ Department of Marketing and Information System, Aichi Institute of Technology, 1247 Yachigusa, Yakusa-cho, Toyota 470-0392, Japan

RAIRO - Operations Research - Recherche Opérationnelle, Tome 36 (2002) no. 3, pp. 227-235.

Résumé

This paper considers two backup schemes for a database system: a database is updated at a nonhomogeneous Poisson process and an amount of updated files accumulates additively. To ensure the safety of data, full backups are performed at time $N T$ or when the total updated files have exceeded a threshold level $K$ , and between them, cumulative backups as one of incremental backups are made at periodic times $i T$ $(i = 1, 2, \dots, N - 1$ ). Using the theory of cumulative processes, the expected cost is obtained, and an optimal number $N^{*}$ of cumulative backup and an optimal level $K^{*}$ of updated files which minimize it are analytically discussed. It is shown as examples that optimal number and level are numerically computed when two costs of backup schemes are given.

EuDML MR Zbl

DOI : 10.1051/ro:2003004

Mots clés : database, full backup, cumulative backup, cumulative process, expected cost

Affiliations des auteurs :

Qian, Cunhua ; Pan, Yu ; Nakagawa, Toshio ¹

¹ Department of Marketing and Information System, Aichi Institute of Technology, 1247 Yachigusa, Yakusa-cho, Toyota 470-0392, Japan

@article{RO_2002__36_3_227_0,
     author = {Qian, Cunhua and Pan, Yu and Nakagawa, Toshio},
     title = {Optimal policies for a database system with two backup schemes},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {227--235},
     publisher = {EDP-Sciences},
     volume = {36},
     number = {3},
     year = {2002},
     doi = {10.1051/ro:2003004},
     mrnumber = {1988278},
     zbl = {1062.90020},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/ro:2003004/}
}

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Qian, Cunhua; Pan, Yu; Nakagawa, Toshio. Optimal policies for a database system with two backup schemes. RAIRO - Operations Research - Recherche Opérationnelle, Tome 36 (2002) no. 3, pp. 227-235. doi : 10.1051/ro:2003004. http://www.numdam.org/articles/10.1051/ro:2003004/

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