June 2004
Intermediate to advanced
396 pages
9h 28m
English
book
Building and Scaling SAP Business Information Warehouse on DB2 UDB ESE
by Chuck Ballard, Andreas Christian, Theodor H. Kuebler, Rodrigo A. Schiavon
Content preview from Building and Scaling SAP Business Information Warehouse on DB2 UDB ESE
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32 SAP BW and DB2
2.7 Aggregates
Aggregates represent another technique for improving query performance. They
are materialized, summarized views of the data in an InfoCube, and store a
subset of InfoCube data in a redundant form. When an appropriate aggregate for
a query exists, the summarized data can be read directly from the database
during query execution instead of having to perform this summarization during
runtime. In SAP BW, the system generates suggestions for creating optimal
aggregates. The system administrator can then decide whether to create those
aggregates.
Aggregates reduce the volume of data to be read from the database, speed ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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