October 2012
Intermediate to advanced
316 pages
8h 47m
English
book
IBM Cognos Dynamic Cubes
by Dmitriy Beryoza, Shilpa Bhimavarapu, Alan Blake, David Cushing, Vlaunir Da Silva, Mario Daigle, Avery Hagleitner, Ian Henderson, Beth Jubera, Skyla Loomis, Chris McPherson, Steven Rogers, Carlos Ruiz, Christopher Yao
Content preview from IBM Cognos Dynamic Cubes
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Chapter 2. IBM Cognos Dynamic Cubes architecture 29
2.3.2 Expression cache
A set within the context of MDX contains one or more tuples. A tuple contains a member from
one or more dimensions, where one of those dimensions can be the measures dimension.
Tuples within a set in MDX each contain a member from the same set of dimensions and in
the same order.
The expression cache is used by the MDX engine to cache the result of set expressions that
operate on large sets and output a much smaller set for subsequent reuse, either within the
same query or within subsequent MDX queries processed by the MDX engine. The savings
from the use of cache expression results can be significant, given that in some cases a set
can contain millions of tuples and ...
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