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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! ) These irrelevant intersections do have significant storage structure overhead. So, simply by combining dimensions (it2) we implement a more efficient model. 9 Summary In this chapter we presented an overview of the major components of the DB2 OLAP multidimensional storage structures. The chapter began by discussing the inherent importance of the matrix-oriented application server as a viable information systems database.
The outline can really be considered comprehensive from the perspective of database creation and design. In itself, this outline is a significant contribution to DB2 OLAP implementation practices. This chapter does not include any significant discussion of topics presented. Most topics are attended by no commentary at all. This has been done on purpose. Wherever possible we include references to contents and practices contained elsewhere in this redbook. In Table 9, we have provided readers with an outline they can use as an OLAP checklist for quick reference.
Their impact must be well understood. 3 The data block and index revisited The data block reserves one cell for every intersection point (the Cartesian product) for all of the members from each dimension that is tagged dense. Sparse member combinations that contain data drive data block creation. So, if we were to implement a database design that tagged as dense the dimensions of Time, Measures and Products (assuming that, after all, we do sell all of our products every day), only those customers that actually make purchases will cause a data block to be created.