Hello Rama,
SDE account have permission in SYS DB if not please do that.
SDE account work as master user.
or you can use SDEMON command to view locks
sdemon -o info -I <{users | users_long | config | stats | locks | vars | instances}>
[-q] {[-i {<service> | <port#> | <direct connection>}]
[-s <server_name>] | [-H <sde_directory>]}
[-u <user_name>] [-p <user_password>] [-D <database_name>]
sdemon
Thanks.