Partition join in a partitioned database system
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United States of America Patent
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Apr 10, 2007
Grant Date -
N/A
app pub date -
Dec 30, 2003
filing date -
Dec 30, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A method for performing a join of a first table and a second table is disclosed. In one instance, each of the plurality of first table rows is grouped into one of a plurality of first table partitions. It is determined that a partitioning column of the first table is specified in an equality condition of the join. One of the plurality of second table rows is selected, and a partition number is generated for the selected one of the plurality of second table rows. For a second table row for which a partition number was generated, a first table partition with a partition number that matches the generated partition number is identified, and a product join is used to join the one or more first table rows in the matching partition with the selected one of the second table rows.
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