DB2 prerequisites checking

The recommended approach to do DB2 installation prerequisites checking includes two steps:

1. Verify that your environment meets the disk, memory, and installation requirements for the operating system and DB2 product that you are planning to install.

2. Review the DB2 Release Notes for information about the functionalities of this release and how to perform the installation in a different platform.

Generally, we have to consider the following items before installing DB2:

The disk space required for your product depends on the type of installation that you choose and the type of file system that you have. Remember to include disk space for required software, communication products, and documentation.

The basic memory requirement for a system running just DB2 UDB and the DB2 GUI tools is 512 MB, but IBM recommends 1 GB of RAM memory for improved performance. These requirements do not include any additional memory requirements for other software that is running on your system.

The SDK is installed whenever a component that requires Java is being installed. However, if the installer detects that SDK is already installed, it will not install it again. The SDK is installed in its own directory and does not overwrite any previous levels of the SDK. In cases where 64-bit Java is required, a message appears telling you that Java 64-bit is required.

You can issue the version of JDK by issuing the following command, to make sure that the JDK level is aligned with the requirement of a specific DB2 UDB version:

java -version

The sample output is displayed as shown in Figure 8-3.



Figure 8-3 Java version display

For the most up-to-date SDK for Java information, see the Java support for DB2 UDB Web page at:

http://www-1.ibm.com/support/docview.wss?rs=71&uid=swg21251460
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