parallel database query optimization 并行数据库查询优化
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。
The search space of parallel query execution plan is exponential complexity. How to prune the search space efficiently is the key problem of parallel query optimization.
并行查询执行计划的搜索空间里指数级增长，如何高效地裁剪搜索空间是并行查询优化的关键所在。
The key problem is how to prune the big search space in order to get an optimized query plan for query parallel optimization.
并行查询优化器的目标是缩减庞大的计划搜索空间，获得优化的查询规划。
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