(1) The person who controls and manages a computer system.
(2) In OSI, a person who controls how the open system resources of a system or enterprise are used.
(3) A DB2 database user with administrative authority. In DB2 Database for Linux, UNIX, and Windows, this authority is SYSADM. In DB2 for i5/OS, this authority is *ALLOBJ authority. In DB2 for z/OS, this authority is SYSADM.