【作者】 韩伟红； 刘艳春； 贾焰；

【机构】 国防科技大学计算机系；

【摘要】 <正>1.简介多库系统中的全局视图是由底层LDB视图获得的,如果不保留物理的全局视图,则每次访问全局视图时都要重新计算生成,因此保留物理的全局视图可以大大加快访问速度。底层数据库的修改将会导致全局视图的改变,因此,更多还原

【Abstract】 In multidatabase we usually save materialized views to speed up queries.in this case we need a view maintenance method.Deferred maintenance can speed up the update transactions by shifting maintenance into a deferred transaction,but even strict two phase locking(2PL) can not guarantee the serializable execution of transactions.This paper develops a serializabitity theory based upon conflicts and serialization graphs in presece of materialized views.This theory has been used well in CBMS(CORBA Based Multidatabase System) which was developed by us.更多还原