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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98 SAP BW and DB2
Part of the searched INSERT and UPDATE statements is a join between F-fact
and E-fact tables. These tables are collocated, which means that they are on the
same partitions and have the same partitioning key. For this reason, DB2 can
use a collocated join, as shown in Figure 4-11.
On each partition, it joins only the local data of the F-fact and E-fact tables on
that partition. No communication between partitions is required. Therefore, the
compression scales linearly with the number of database servers. Thus, if you
double the number of database servers, the request is compressed twice as fast.
Figure 4-11 DB2 uses a collo
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