By this method , the system can integrate each local database system and offer inquiry services to users as a whole and at the same time enable self - administration of each subsystem keeping its own business unknown by other systems 通过这种方法可以使系统集成各局部数据库系统,以全局数据库的方式向用户提供查询功能。同时,各子系统都保持自治性,具有其本地的不为全局所知的事务运行。
The module structure of distributed database includes local internal stratum , local concept stratum , global concept stratum and global internal stratum . the management of the distributed system is composed of global database management system , local database management system and communication management 分布式数据库的模式结构分为局部内层、局部概念层、全局概念层和全局外层四个部分,数据库的管理又是由全局数据库管理系统、局部数据库管理系统和通讯程序来完成的。
The system is embedded software , working on the wdpf ii control system of westinghouse corp . of usa and communicating to the control system real time , calling the global database , using some tools of wdpf system . in order to improve ocs working efficiency , we have to research the wdpf control system constructions , network structure , data type , database structure , communication mode , system tools applying and so on . so ocs uses the wdpf ii resource as possible as it can in developing program 由于本系统为典型的嵌入式软件,工作在西屋公司wdpf控制系统之上,并与控制系统实时保持通信,随时访问系统的全局数据库,同时访问利用该系统的各种工具软件,所以在软件设计前对wdpf自动化控制系统的系统组成、网络结构、数据类型、数据库结构、通信方式、系统软件应用等方面都作了非常仔细的研究并在系统编制时对数据及设备资源作了最大的利用。
Distributed database technology is the integration of database technology and computer network technology . apart from the characteristics of centralized database such as data logical independence and physical independence , it has its own unique characteristics such as distributed independence of data . it has to consider not only the self - government of local places , but also the logical integrity of the whole database 分布式数据库技术是数据库技术和计算机网络技术的结合,它除了具有集中式数据库所具有的特点外,还具有它自己独有的特点:它不但要考虑局部场地的自治,而且要解决全局数据库的逻辑整体性;它除了具有集中式数据库所具有的数据逻辑独立性和物理独立性,还具有数据的分布独立性。
全局: overall situation; whole sit ...数据库: data bank; data base; data p ...全局数据库系统: global data base system; global database system全局数据: global data全局数据项: global item静态全局数据: static global data全局数据访问: global data access全局数据管理: global data manager全局数据模块: global data module全局数据模型: global data model全局数据区域: global data area全局数据视图: global view of data全局数据系统: global data schema消除全局数据: removing global data全局数据管理程序: global data administrator; global data manager全局数据流分析: global data flow analysis; globaldataflowanalysis环球数据线路,全局数据总线: global data link局数据: office data od共用数据管理器,全局数据管理程序: gdm global data manager文件中定义的全局数据太多: too much global define in file布局数据: topological data局数据变更: office data change局数据卡: office data card局数据文件: office data file数据库;数据库: data bank