Investigation continues. The issue is running the subroutine in separate threads. And when l wrote this some years ago, l put a comment about the following code.

It looks like this code no longer works, i.e. the refined warnings continue. It is the connect_to_database code that is triggering the redefin warnings.

I removed use warnings altogether, replaced the code below with no warnings in different varieties - but CANNOT remove the redefined warnings.

Any suggestions? I need each thread to hold a separate connection to the database.

######################################################################
+#########
# Function:     connect_to_database
# Purpose:      Connect to the Oracle database
# Arguments:    $db_uid, $db_pwd, $db_sid
# Returns:      $dbh
######################################################################
+#########
sub connect_to_database($$$)
{
        # Declare the variables
        my ($db_uid, $db_pwd, $db_sid) = @_;
        my $dbh;
        my %attribs = (
                PrintError => 0,
                AutoCommit => 0,
                RaiseError => 0
                );

        $dbh = DBI->connect("DBI:Oracle:".$db_sid, $db_uid, $db_pwd , 
+\%attribs )
                or  die "ERROR: Can't connect to database ($db_uid\@$d
+b_sid): ".$DBI::errstr."\n";

        return $dbh;
}

.....
        # Remove erroneous "subroutine redefined" warning
        {
                BEGIN { $^W = 0 }
                $dbh = connect_to_database($db_uid, $db_pwd, $db_sid);
        }
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