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
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
1989年第6期107-108,106,共3页
Journal of Harbin Institute of Technology
关键词
数据库
机械系统
树结构
多级查询
Database machines
query optimization
knowledge bases
