When asking for help , always post your db2 server version and fixpack, and the operating-system name and details.
Most likely there is a connection holding a catalog lock which is blocking your job.
Normally such a command would complete fast (within a second) if there are no locks.
Find which session(s) are holding catalog locks for extended periods, and if they are currently idle, then check carefully if they can be forced or persuaded to commit/rollback and thereby release the locks. If you don't know how to do these basic things you should ask an experienced DBA at your site.