Figure 5.1 illustrates the different levels in which you can configure your DB2 environment. You can use
Environment variables at the operating system level
The DB2 profile registry variables at the operating system and instance levels
The Database Manager (DBM) Configuration file at the instance level
The database configuration file at the database level
Configuration Advisor graphical tool, which can set parameter values based on your answers to simple questions about your system. Chapter 16, Database Performance Considerations, discusses this tool in more detail.