DB2 Version 10.1 for Linux, UNIX, and Windows

System environment variables for IBM Data Server Driver Package (Windows)

Starting with DB2® Version 10 Fix Pack 1, Windows system environment variables are updated to include the location of the default client interface copy for the IBM® Data Server Driver Package software.

The Windows system environment variables are updated in the following scenarios:

When you install the IBM Data Server Driver Package software as the default client interface copy
When you make the IBM Data Server Driver Package copy to be the default client interface copy by using the db2swtch command
When a default client interface copy undergoes an upgrade

System environment variables are also modified to remove references to the IBM Data Server Driver Package software in certain scenarios:

If you promote a server or client product to be the default DB2 copy, the reference to the default client interface copy is removed from system environment variables. This situation applies when you promote the server or client product during an installation, a fix pack update, or a switch by using the db2swtch command.
Starting with IBM DB2 for Linux, UNIX, and Windows, Version 9.7 Fix Pack 6, if the IBM Data Server Driver Package software coexists with the default DB2 copy for an earlier server or client fix pack, the default client interface copy and default DB2 copy path coexist in the system variables. Manually clean up these variables to remove conflicting paths, or run the db2swtch command to complete the following tasks:
1. Demote the current client interface copy
2. Promote the current client interface copy again for the Fix Pack 6 or later IBM Data Server Driver Package copy

To avoid conflict among system environment variables about which path to use when multiple DB2 client or server products are already installed, the IBM Data Server Driver Package copy does not update these environment variables during installation. Message DBI20008W is written to an installation log file in the My Documents\DB2LOG\ directory when another IBM data server client or driver is already installed. The log file name uses the following format: DB2_ProductNameAbbrev-DateTime.log, where DB2_ProductNameAbbrev is an abbreviated form of the product name and DateTime is the timestamp. An example of a message is dsdriver_log-Tue Jan 24 13_34_54 2012.log.