Multi-tier query processing
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United States of America Patent
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Issued Date -
Dec 22, 2005
app pub date -
Jun 22, 2004
filing date -
Jun 22, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Techniques are provided for processing a query including determining a first cost based on the original query; if the query has a subquery, generating a second query with the subquery unnested; determining a second cost based on the second query; determining whether the second query includes a mergeable view; and if the second query includes a mergeable view, then generating a third query with the view merged; determining a third cost based on the third query; and choosing an output query from among the set of semantically equivalent queries based on costs associated with the semantically equivalent queries, where the set of semantically equivalent queries includes two or more of the original query, the second query, and the third query.
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