文档介绍：Restoring past Data Statuses of Database
Wenhui ZHANG, Qi CHEN, RuiZhao YU
Institute of Artificial Intelligence Zhejiang University, Hangzhou 310027
E-mail: wenhz@
Abstract redo it when there is something incorrectly done
In database systems, restoring the data status purposely or not. It’s no doubt that the best way to
sadof database at a specific past time can be used to meet these demands is to restore the data status at that
support many special user demands for business time. For example, a human resource manager finds
management. Unfortunately, most database there are some doubtful points in a salary
systems in use fail to support this restoration calculation[2] five months ago, he hopes the database
because of their limits in design. In this article can trace back to the data status when that calculation
we provide a method named ASVM (attribute- was performed and recalculate the salary for a check.
set version method) to develop a design in But he will soon find out the database can’t do it
relational database. It supports the restoration of because some data have changed caused by the job
data statuses in database at any past temporal shifting, the regulation of salary items, etc. These data
point during the whole life of the database were not properly time tagged for the aim of
system, through which we satisfy those special restoration b