Connection Oracle database from Postgres function

I want to access Oracle database from Postgres. One way to use DBI-LINK and
use "plperl" function in Postgres to make connection with Oracle. Using that
I am getting the following error.

Environment

Solaris 9 SPARC

PostgreSQL 8.0

DBI-LINK

Perl-5.8.5

-------------------------------------------------------------------

My Function

CREATE FUNCTION perl_max (integer, integer) RETURNS integer AS $$

if ($_[0] > $_[1]) { return $_[0]; }

return $_[1];

$$ LANGUAGE plperl;

-------------------------------------------------------------------

On running this above function from sql prompt, I am getting this error, and
connection with database lost

test=# select perl_max(1,2);

server closed the connection unexpectedly

This probably means the server terminated abnormally

before or while processing the request.

The connection to the server was lost. Attempting reset: Failed.