查询优化是并行数据库系统的核心技术。
Query optimization is the critical technique of parallel database systems.
数据倾斜对并行数据库系统性能的影响极大。
Data skew has great effects on the performance of parallel database systems.
多连接查询优化是并行数据库系统的核心问题。
The multi-join query optimization is the critical problem of parallel query optimization in parallel database system.
这是对并行数据库系统以及其设计问题的一个很好的综合介绍。
This is a good general introduction to parallel database systems and the issues involved in their design.
本文考虑在并行数据库系统中基于归并排序的分组操作和集函数计算。
This paper considers SQL Group-By and aggregation based on merge-sort in parallel database systems.
由多台服务器组成的并行数据库系统为当前大型电子商务和电子政务的应用提供了优秀的平台。
The parallel database system consists of many servers provides a excellent platform fore-commerce and e-government.
针对分布式并行数据库系统DPDBS中数据库副本数、数据库分布等信息的动态性，提出全局数据目录的动态管理和维护算法。
Aiming at the dynamic characteristic of the data directory in distributed and parallel database system (DPDBS), the dynamic arithmetic for whole data directory is put forward.
本文主要研究分布式并行数据库的一致性机制，数据库的一致性机制是保证分布式并行数据库系统能正常提供数据库服务的基础。
This thesis mainly research the consistency mechanism of distributed and parallel database, the consistency mechanism of database system can provide user normal database service.
本文从并行数据库系统的体系结构、并行数据库的查询，聚集，排序及数据可靠性等方面入手，阐述了对并行数据库的认识和看法。
This paper discusses the understanding on the parallel database from the architecture of parallel database systems, parallel database query, aggregation, sorting, and data reliability.
本文从并行数据库系统的体系结构、并行数据库的查询，聚集，排序及数据可靠性等方面入手，阐述了对并行数据库的认识和看法。
This paper discusses the understanding on the parallel database from the architecture of parallel database systems, parallel database query, aggregation, sorting, and data reliability.
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