Multi-Join Query Optimization;
多连接查询优化；
The multi-join query optimization is the critical problem of parallel query optimization in parallel database system.
多连接查询优化是并行数据库系统的核心问题。
Now most of the research work is based on the storage of single relation, and could not support effectively complex multi-join query.
已有的研究工作多集中在基于单个关系的存储分布，不能有效支持复杂多连接查询处理。
To improve the execution efficiency of the query processors, the authors exploit heuristics to seek the optimum parallel scheduling execution plan for multi-join expressions.
为了提高查询处理器的执行效率，采用启发式规则来搜索最优的多连接表达式并行调度执行计划。
Under data warehouse environment, the complex query of the mass data are met frequently, including the multi-tables join, gathers the computation and so on.
在数据仓库环境下，经常会碰到涉及大量数据的复杂查询，包括多表连接、聚集计算等。
Under data warehouse environment, the complex query of the mass data are met frequently, including the multi-tables join, gathers the computation and so on.
在数据仓库环境下，经常会碰到涉及大量数据的复杂查询，包括多表连接、聚集计算等。
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