If you're getting ns_db not enabled, it absolutely means that your driver didn't load correctly. Go through your log file and search for "postgres.so" and see if it's loading it up. If not, you need to make sure that you've got the right name for your .so file, that the permissions are correct (e.g. execute permissions for nsadmin), that your param file has all the right settings to load postgres.so as a DB driver. The pool errors should be dealt with once you know you're loading the driver for sure.
