Method and system for look ahead query evaluation planning based on interesting partition properties
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United States of America Patent
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Feb 5, 2002
Issued Date -
N/A
app pub date -
Mar 2, 2000
filing date -
Jun 30, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A relational data base management system includes a query processor that uses a query operator partition property to perform QEP pruning and to ensure that data input to a query operator is partitioned appropriately for the operation. The partition property indicates the group of network nodes across which a table is distributed. The query processor also makes use of partition classes that are designated 'interesting classes' to perform preoptimization planning and query pruning, and to perform look-ahead partitioning based on partition classes that are identified as being of interest to future operations, thereby more efficiently evaluating complex query statements in an MPP, shared-nothing environment.
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