The big diffrence between SYSDBA and SYSOPER privs is that SYSDBA can do anything (just like root). The SYSOPER privs allow you just about the same amount of control but won't allow you to look at user data. Both privs allow you to ALTER DATABASE, CREATE SPFILE, STARTUP or SHUTDOWN, ALTER DATABASE ARCHIVELOG, and includes RESTRICTED SESSION privs. However, only SYSDBA can CREATE or DROP DATABASE, and the ALTER DATABASE RECOVER options for SYSOPER are limited to complete recovery only.
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