作　　者： ; ;

机构地区： 哈尔滨工业大学计算机科学与技术学院计算机科学与工程系

出　　处： 《哈尔滨工业大学学报》 1989年第6期107-108,106,共3页

摘　　要： The three-level query optimization strategy in TDM system is introduced inthis paper,semantic query conversation,accessing path selection,and query taskschedule.This strategy can solve the bottle problems in data transmitting and dataprocessing,and can improve the query processing efficiency of the system.TDM is a tightly-coupled tree-structured database machine.It consists of mul-tiple sub-tree-dements (STEs),shown in Fig.1,An STE is a basic data pro-cessing sub-system.The partitioned database is distributed on the STEs.But thedata in each relation is only stored in the disks of a relevant STE,and is processedparallely by the BCP and the SPs in that STE.The multilevel query

关 键 词： 数据库 机械系统 树结构 多级查询

领　　域： [自动化与计算机技术] [自动化与计算机技术]