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Parallel preparation of a query execution plan in a massively parallel processing environment based on global and low-level statistics
Parallel preparation of a query execution plan in a massively parallel processing environment based on global and low-level statistics
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机译:基于全局和低级统计信息,在大规模并行处理环境中并行准备查询执行计划
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摘要
In an approach to preparing a query execution plan, a host node receives a query implicating one or more data tables. The host node broadcasts one or more implicated data tables to one or more processing nodes. The host node receives a set of node-specific query execution plans and execution cost estimates associated with each of the node-specific query execution plans, which have been prepared in parallel based on global statistics and node-specific low level statistics. The host node selects an optimal query execution plan based on minimized execution cost.
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