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DB2 Cube Views: A Primer
book

DB2 Cube Views: A Primer

by Corinne Baragoin, Geetha Balasubramaniam, Bhuvaneshwari Chandrasekharan, Landon DelSordo, Jan B. Lillelund, Julie Maw, Annie Neroda, Paulo Pereira, Jo A. Ramos
September 2003
Beginner to intermediate content levelBeginner to intermediate
754 pages
18h 9m
English
IBM Redbooks
Content preview from DB2 Cube Views: A Primer
146 DB2 Cube Views: A Primer
Figure 4-8 Extract
Extract query optimization is based on the bottom slice of the cubes defined for
the cube model. Performance improvements will vary depending on how close
the base level of the cube is to the bottom of the cube model. The higher the slice
is on the cube model, the higher the expected performance improvements are.
Accessing the higher level data without these summary tables in place will
require repeated and costly queries to get the base data for the cube. With the
summary tables that pre-compute the aggregations at the base level of the cube,
there will be a lot of performance improvement.
The c ...
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Publisher Resources

ISBN: 0738499730Purchase book