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 or when the total updated files have exceeded a threshold level , and between them, cumulative backups as one of incremental backups are made at periodic times ). Using the theory of cumulative processes, the expected cost is obtained, and an optimal number of cumulative backup and an optimal level 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.
Mots clés : database, full backup, cumulative backup, cumulative process, expected cost
@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},
zbl = {1062.90020},
mrnumber = {1988278},
language = {en},
url = {http://www.numdam.org/articles/10.1051/ro:2003004/}
}
TY - JOUR AU - Qian, Cunhua AU - Pan, Yu AU - Nakagawa, Toshio TI - Optimal policies for a database system with two backup schemes JO - RAIRO - Operations Research - Recherche Opérationnelle PY - 2002 DA - 2002/// SP - 227 EP - 235 VL - 36 IS - 3 PB - EDP-Sciences UR - http://www.numdam.org/articles/10.1051/ro:2003004/ UR - https://zbmath.org/?q=an%3A1062.90020 UR - https://www.ams.org/mathscinet-getitem?mr=1988278 UR - https://doi.org/10.1051/ro:2003004 DO - 10.1051/ro:2003004 LA - en ID - RO_2002__36_3_227_0 ER -
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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