Creating and configuring instances for non-partitioned environments

A DB2 instance can be defined as a logical container or as a logical context for databases. It can also be described as a layer between DB2 software binaries, a database, and its objects. Also it provides a level of isolation between databases; for example, it is possible to have two or more databases on the same environment, with the same name, but under different instances. It also provides and ensures the communication layer between clients and databases.

Getting ready

For this recipe (and almost all recipes in this book), we will use two servers running Red Hat Enterprise Linux Server x64 release 5.5 (Tikanga), named nodedb21 and nodedb22. The hostnames are optional, but our recommendation is to set up an identical environment to avoid confusion during reading and applying the recipes.