Abstract
As the computer system has developed much in this highly information-oriented society, database security has become a very important problem and its backup strategies need to be made more efficiently and safety. The image copy method has been used as the most simple and dependable recovery mechanism for media failure. However, this method spends high overhead costs for massive data transmission and much processing time in the normal operation of the database. To cover such weak points, incremental and full backup methods are adopted before updated trucks reach a predetermined level. Moreover, when the number of full backup files exceeded a predetermined level, we stop incremental and full backups and switch it to the image copy. This paper applies cumulative damage model to backup of files in a database system, by putting damage shock by update, failure shock by database failure and damage by dumped files, and considers the tradeoff among overhead costs of image copy and incremental, full backup methods, and discusses analytically an optimal policy for the image copy backup interval. Finally, numerical examples are given in the case of Poisson process and exponential distributions.
Highlights
In this highly information-oriented society, database security [1] in computer systems has become a very important problem
When we refer to the backup techniques for the database systems, image copy [9] is the most simple and dependable method to ensure the safety of data and is always to take the backup copies of all files in other places and to take out them if files in the original secondary media are broken
We propose the following backup policy which ensures the safety of data and saves hours: The image copy is carried out at scheduled times, and between these backups, the incremental backup or full backup at each files, which takes all copies of newly updated files since the image copy, is done
Summary
In this highly information-oriented society, database security [1] in computer systems has become a very important problem. When we refer to the backup techniques for the database systems, image copy [9] is the most simple and dependable method to ensure the safety of data and is always to take the backup copies of all files in other places and to take out them if files in the original secondary media are broken. As referred as in [9], image copy backup is necessary to any database system for its whole security strategy, it is restricted to be performed weekly or monthly until now Such a strict periodic image copy backup policy is unreasonable and could be optimized from the following two points: 1) this backup technique has its superiority that it could copy all files.
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