splitlog.pl resources exhausted

Ned Schumann (ned@olympus.net)
Sun, 2 Mar 1997 13:44:42 -0800 (PST) 

splitlog is exiting with the following error message...

Allocation too large at ./splitlog.pl line 714.

        while (($ipnum, $value) = each %DNScache)
        {
            ($host, $seen) = split(/\|/, $value);
            if ($StartTime > ($seen + $DNSexpires)) {
line 714 -->     push(@expired, $ipnum);
            }
        }

Indicating that the dnscache.db file is probably too large at 6Mb.
-rw-------  1 wwwadmin  users  5947392 Mar  2 12:52 dnscache.db

How do I increase the resources? I'm running BSDI 2.1 with 51Mb free and I
invoked splitlog as follows... 

./runMKstats where 'runMKstats' is .. 
unlimit nice 
./splitlog.pl -x -dir /pathtoLogDirectory -dns -C 404 /var/log/apache_access.0

Thanks!
Ned