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Extra resources for DB2 OLAP Server: theory and practices

Sample text

Do the business requirements indicate that one or more dimensions in the cube will be defined with many members and with many levels? This may require that partitioning options be investigated. • Are the business reasons for the project basically retrieval and analysis of information or is there also a process that is being implemented (such as budgeting). If a process is being implemented, the use of VBA applications or other client tools to control the process (as automated running of calc scripts, controlled input screens, and so forth) should be investigated.

Tagging some dimensions dense creates the block DIM(172, 21, 27, 32, 209, 32765) Figure 2. Dense dimensions form the block Every data block that is created in the database has an identical structure. In this example, it contains precisely 172 * 21 * 27 = 97,524 cells, or intersection points. PAG files. 12 DB2 OLAP Server - Theory and Practices Addressing, or locating, blocks of data is provided by means sparse member combinations. IND files. By enabling these two definitions of array dimensions, the creators of Arbor Essbase enabled the matrix to be modular.

One-to-one correlations between dimensions require a single dimension be implemented. Consider the 2 database outlines in Figure 7. Figure 7. Combining dimensions The outline on the left in Figure 7 has its one-to-one members arranged hierarchically. The outline on the right arranges the hierarchies as independent dimensions. Chapter 1. Introducing OLAP 19 The total number of intersection points generated by left outline is 1,232. The total number of intersection points generated by the right outline is 15,120!

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