Summary

This chapter described the creation and use of aggregates and multi-cubes. Aggregates, a key technique for improving query performance, can be used in multi-cube queries. Without resorting to aggregates, a complex query on a large multi-cube may experience an unacceptable response time.

Key Terms

Term Description
Aggregate An aggregate is a subset of an InfoCube. The objective when using aggregates is to reduce I/O volume. The BW OLAP processor selects an appropriate aggregate during a query run or a navigation step. If no appropriate aggregate exists, the processor will retrieve data from the original InfoCube.
Multi-cube A multi-cube is a union of basic cubes. The multi-cube itself does not contain any data; rather, the data reside in the basic cubes. To a user, the multi-cube resembles a basic cube. When creating a query, the user can select characteristics and key figures from different basic cubes.

For Further Information

• OSS Note 0175534, "Large BW Systems and Performance of Aggregate Build."

• OSS Note 0379736, "How Does a MultiCube Work?"

• OSS Note 0327876, "MultiCube Query and Using Several Aggregates."

Next…

Chapter 9 discusses the Operational Data Store (ODS).

Part I. Guided Tours

Business Scenario and SAP BW

Creating an InfoCube

Loading Data into the InfoCube

Checking Data Quality

Creating Queries and Workbooks

Managing User Authorization

Part II. Advanced Topics

InfoCube Design

Aggregates and Multi-Cubes

Operational Data Store (ODS)

Business Content

Generic R/3 Data Extraction

Data Maintenance

Performance Tuning

Object Transport

Appendix A. BW Implementation Methodology

Object Transport

Appendix B. SAP Basis Overview

Object Transport

Appendix C. Glossary

Appendix D. Bibliography



SAP Bw. A Step-By-Step Guide
Sap Bw: a Step By Step Guide for Bw 2.0
ISBN: B000LZM8CM
EAN: N/A
Year: 2002
Pages: 106

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