Environment variables

To override driver resources, use environment variables. Usually, you configure a default set of resource parameters in the resource file; the administrator can override these default settings with environment variables.

Primarily, an environment variable corresponds to each resource parameter. The environment variable name is usually the uppercase equivalent of the resource parameter name.

As with the database driver resources, you can use some environment variables to modify the behavior of the database driver (server); you can use others to modify the behavior of the application virtual machine (client). If you must use a database driver environment variable for the server, you must set the database driver on the machine that runs the database driver to override the corresponding driver resource. If you must use a database driver environment variable for the client, you must set the variable on the machine that runs the application virtual machine to override the corresponding driver resource.