Hi Nikhil,
I concur with Krishna comments and there was typo in my earlier post,it should be like:
Mostly, if you have created the table in your User like Nikhil_schema. It will be not visible to other users.
Alternatively, if SQL privilege like NO update can be also set the USER_B. In this case USER_B,will never able to update any table in HANA.
Regards
Santosh.