Environment variables

Environment variables can be used to override driver resources. Usually, a default set of resource parameters is configured in the resource file. The administrator can override these default settings with environment variables.

For the most part, there is an environment variable corresponding to each resource parameter. The environment variable name is usually the uppercase equivalent of the resource parameter name. As with the database driver resources, some environment variables are used to modify the behavior of the database driver (server) and some are used to modify the behavior of the application virtual machine (client). When a database driver environment variable for the server is to be used, it must be set on the machine running the database driver to override the corresponding driver resource. When a database driver environment variable for the client is to be used, it must be set on the machine running the application virtual machine to override the corresponding resource.