在多库系统中，对全局视图的存取操作要分解为针对多个LDB的子操作，可能还要对数据模式及查询语言进行转换。
In multidatabase, access to global view will be decomposed to several sub-operations to several LDB, and perhaps also need data schema translation and query processing.
在上世纪七十年代以前，为保证计算机系统中的信息安全性，自主存取控制和强制存取控制策略在计算机多安全级系统中得到了广泛的应用。
Before 1970, in order to protect the information security in computer systems, mandatory and discretionary access control policy had been widely applied in secure computer systems.
在上世纪七十年代以前，为保证计算机系统中的信息安全性，自主存取控制和强制存取控制策略在计算机多安全级系统中得到了广泛的应用。
Before 1970, in order to protect the information security in computer systems, mandatory and discretionary access control policy had been widely applied in secure computer systems.
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