Difference between sys and system in oracle 11g
I know that both the sys and the system users created within the creation of the Oracle Database and each of them granted the DBA role , and I also know that system is little bit weaker than SYS
so I want to know the difference between them and why oracle create 2 users with DBA role
SYS & SYSTEM
isn't SYS enough ?
I want also to know a lot about the users SYSMAN & DBSNMP
thanks in advance.