Hi It would be good to a reply for my question from colleagues
I have developed a database server in arc catalog in my local machine. Initially, I was administrator for this database. I have added some users and set their level of permission. On one occasion I have changed my administration permission (uncheck). Now I could do any administrative work like, setting permission, data retrieving, data back up etc. Even now database does not show any option to change the permission (permission is disabled/absent). So how can I retrieve my (re set up) administration permission to the database server.