Database system with methodology for parallel schedule generation in a query optimizer
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United States of America Patent
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Aug 11, 2009
Grant Date -
Apr 13, 2006
app pub date -
Oct 13, 2004
filing date -
Oct 13, 2004
priority date (Note) -
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Abstract
A database system with methodology for parallel schedule generation in a query optimizer is described. In one embodiment, for example, in a database system, a method is described for parallel optimization of a query, the method comprises steps of: generating a plurality of parallel plans for obtaining data requested by the query, the parallel plans including parallel operators for executing portions of the query in parallel; adjusting parallel operators of each parallel plan if necessary based on resources available for executing the query; creating a schedule for each parallel plan indicating a sequence for execution of operators of each parallel plan; determining execution cost of each parallel plan based on its schedule; and selecting a particular parallel plan having lowest execution cost for obtaining data requested by the query.
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