System and method for database query optimization
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United States of America Patent
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N/A
Issued Date -
Mar 27, 2003
app pub date -
Sep 5, 2002
filing date -
Sep 21, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In a database management system, a query analysis/optimization block converts a query into a graph by a query graph creation block and converts each edge of the graph into an execution tree by an execution tree conversion block, thereby creating an intermediate plan. The created intermediate plan is held on a cost priority plan queue, a narrow-down priority plan queue, or a nested loops join priority plan queue in an intermediate plan queuing block. When all the edges of the query graph are converted into execution trees, an optimal plan is selected in an optimal plan selection block so as to search for a data search procedure.
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