Data administration: Data administration entails deciding who can create, read, update, or delete data. Many organisations have strict controls over who can create or delete data fields or tables. This is determined by the needs of the organisation and the roles defined for database administrators and users. Read access is usually provided to those who need to only see and use the data, but not modify or change it in any way. Update access is also carefully restricted to those who have the rights and privileges to do so. Modern database systems enable sophisticated ways in which these four functions can be enabled or disabled for users and administrators.