Efficient heuristic approach in selection of materialized views when there are multiple matchings to an SQL query
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United States of America Patent
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Aug 8, 2006
Grant Date -
May 26, 2005
app pub date -
Nov 25, 2003
filing date -
Nov 25, 2003
priority date (Note) -
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Abstract
A heuristic approach is used to order materialized view (MW) candidates in a list based on descending order of their reduction power. A query (e.g., SQL query) is then matched with the MVs in the list order, wherein searching is stopped when matching has been found. The query is matched with materialized views in the ordered list by identifying a materialized view candidate as follows: identifying an MV that is not locked by a REFRESH process; identifying a matching MV that does not require a regroup; identifying a matching MV that does not require a rejoin; identifying a matching MV that does not require a residual join; or identifying an MV with largest reduction power from the list of candidates.
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