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Query processing system of a database using multi-operation processing utilizing a synthetic relational operation in consideration of improvement in a processing capability of a join operation
Query processing system of a database using multi-operation processing utilizing a synthetic relational operation in consideration of improvement in a processing capability of a join operation
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机译:考虑到结合操作的处理能力的提高,使用利用合成关系操作的多操作处理的数据库的查询处理系统
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摘要
A query processing system of a database using multi-operation processing includes a task retrieval unit for retrieving relational algebra as tasks from a query tree, a unit for dividing retrieved tasks into groups for each relation of database, a synthetic relational operation unit for creating a synthetic relational operation by collecting tasks having common sub-expression for the grouped tasks into sub-groups and creating a task of a synthetic relational operation for each sub-group, wherein when there is a plurality of tasks of join operation in the grouped tasks, the synthetic relational operation unit further divides the grouped tasks into sub-groups for each common sub-expression of join operation, collects a plurality of tasks of the join operation into a sub-group, and creates a single task of a synthetic join operation by using logical union to concatenate each task of the join operation collected in the sub-group.
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