SYS
The SYS user owns all base tables and user-accessable view of the data dictionary (Oracle configuration information). No Oracle user should ever alter (update, delete, or insert) any rows or schema objects conatained in the SYS schema, because such activity can compromise data integrety. The security administrator must keep strict control of this central account.
SYSTEM
The SYSTEM user is used to create additional tables and views that display administrative information, and internal tables and views used by various Oracle options and tools.
SYSMAN
The SYSMAN user represents the Enterprise Manager super admin account. This EM admin can create and modify other EM admin accounts as well as admin the database instance itself.
DBSNMP
The DBSNMP user is used by EM to monitor the database. EM uses this account to access performance stats about the database. The DBSNMP credentials sometimes referred to as the monitoring credentials.
No comments:
Post a Comment