Looks like a connect problem with mysql?
as root, I tried restarting mysqld services
# service mysqld restart
but still have same outcome.

[nidb@localhost programs]$ perl parsedicom.pl
Found 0 lock files
Creating /nidb/programs/lock/parsedicom.0.
Mysql connect('database=nidb;host=yourhostname','root',...) failed: Unknown MySQL server host 'yourhostname' (1) at parsedicom.pl line 117