The Berkeley DB library uses the following environment variables:
      
        
          - 
            DB_HOME
          
- If the environment variable DB_HOME is set, it is used as part of
File naming.
Note: For the DB_HOME variable to take effect, either the
DB_USE_ENVIRON or DB_USE_ENVIRON_ROOT flags must be
specified to DB_ENV->open().
- 
            TMPDIR, TEMP, TMP, TempFolder
          
- The TMPDIR, TEMP, TMP, and TempFolder environment variables are all
checked as locations in which to create temporary files.  See
DB_ENV->set_tmp_dir() for more information.