Performance Tuning
Performance is a critical issue in developing a data warehouse because of the size of data in the system. Earlier in this book, we explicitly discussed techniques to help improve performance. For example, in Chapter 7, we considered how to design an InfoCube so that its queries will have better performance.
Two types of performance measurements exist: system throughput and response time. System throughput usually applies to OLTP systems, which are designed to process thousands or even millions of small transactions per day. In contrast, response time typically applies to OLAP systems, which are designed to process massive parallel queries that fetch and sort hundreds of thousands of records from various tables.
The following tactics have proved very effective when tuning performance and are recommended by Oracle:
- Set clear goals for tuning.
- Create minimum repeatable tests.
- Test hypotheses.
- Keep records.
- Avoid common errors.
- Stop tuning when the objectives are met.
- Demonstrate meeting the objectives.
In this chapter, we will first show how to install and use BW Statistics, a BW tool for performance measurement. We will also briefly discuss System Administration Assistant, an SAP function for general system performance monitoring. Finally, we will discuss techniques for tuning query performance and load performance.
Note
The discussion in this chapter applies to Oracle on HP-UX. Refer to the BW documentation for information on other platforms.
Part I. Guided Tours
Business Scenario and SAP BW
- Business Scenario and SAP BW
- Sales Analysis A Business Scenario
- Basic Concept of Data Warehousing
- BW An SAP Data Warehousing Solution
- Summary
Creating an InfoCube
- Creating an InfoCube
- Creating an InfoArea
- Creating InfoObject Catalogs
- Creating InfoObjects Characteristics
- Creating InfoObjects Key Figures
- Creating an InfoCube
- Summary
Loading Data into the InfoCube
- Loading Data into the InfoCube
- Creating a Source System
- Creating an Application Component
- Creating an InfoSource for Characteristic Data
- Creating InfoPackages to Load Characteristic Data
- Checking Loaded Characteristic Data
- Entering the Master Data, Text, and Hierarchy Manually
- Creating an InfoSource for Transaction Data
- Creating Update Rules for the InfoCube
- Create an InfoPackage to Load Transaction Data
- Summary
Checking Data Quality
- Checking Data Quality
- Checking InfoCube Contents
- Using BW Monitor
- Using the Persistent Staging Area (PSA)
- Summary
Creating Queries and Workbooks
- Creating Queries and Workbooks
- Creating a Query Using BEx Analyzer
- Organizing Workbooks Using BEx Browser
- Using a Variable to Access a Hierarchy Node Directly
- Summary
Managing User Authorization
- Managing User Authorization
- Creating an Authorization Profile Using Profile Generator
- Creating an Authorization Object to Control User Access to the InfoCube Data
- Integrating Profile Generator and BEx Browser
- Summary
Part II. Advanced Topics
InfoCube Design
- InfoCube Design
- BW Star Schema
- InfoCube Design Alternative I Time-Dependent Navigational Attributes
- InfoCube Design Alternative II-Dimension Characteristics
- InfoCube Design Alternative III Time-Dependent Entire Hierarchies
- Other InfoCube Design Techniques
- Summary
Aggregates and Multi-Cubes
Operational Data Store (ODS)
- Operational Data Store (ODS)
- Creating an ODS Object
- Preparing to Load Data into the ODS Object, Then into an InfoCube
- Loading Data into the ODS Object
- Loading Data into the InfoCube
- Using 0RECORDMODE for Delta Load
- Summary
Business Content
- Business Content
- Creating an R/3 Source System
- Transferring R/3 Global Settings
- Replicating R/3 DataSources
- Installing Business Content Objects and Loading R/3 Data
- Summary
Generic R/3 Data Extraction
- Generic R/3 Data Extraction
- Creating Views in R/3
- Creating DataSources in R/3 and Replicating Them to BW
- Creating a Characteristic in BW
- Loading Data from R/3 into BW
- Summary
Data Maintenance
Performance Tuning
- Performance Tuning
- BW Statistics
- System Administration Assistant
- Tuning Query Performance
- Tuning Load Performance
- Summary
Object Transport
Appendix A. BW Implementation Methodology
Object Transport
Appendix B. SAP Basis Overview
Object Transport
- Object Transport
- Section B.1. SAP Basis 3-Tier Architecture
- Section B.2. Dispatcher, Work Processes, and Services
- Section B.3. Memory Management
Appendix C. Glossary
Appendix D. Bibliography
EAN: N/A
Pages: 106
