HerryDong 2011-04-06
SYS用户具有DBA权限,并且拥有SYS模式,只能通过SYSDBA登陆数据库。是Oracle数据库中权限最高的帐号
SYSTEM具有DBA权限。但没有SYSDBA权限。平常一般用该帐号管理数据库就可以了。
2.
(1)sys--sysdba
system--sysoper
(2)startup/shutdown/dba管理两个都能做
(3)sys拥有数据字典(dictionay),或者说dictionay属于sysschema
(4)sysdba比sysoper多了一个createdatabase的权限
3.
SYSDBA
PerformSTARTUPandSHUTDOWNOperations
ALTERDATABASE:open,mount,backup,orchangecharacterset
CREATEDATABASE
CREATESPFILE
ARCHIVELOGandRECOVERY
IncludestheRESTRICTEDsessionPRivilege
Effectively,thissystemprivilegeallowsausertoconnectasuserSYS.
SYSOPER
PerformSTARTUPandSHUTDOWNoperations
CREATESPFILE
ALTERDATABASEOPEN/MOUNT/BACKUP
ARCHIVELOGandRECOVERY
IncludestheRESTRICTEDSESSIONprivilege
Thisprivilegeallowsausertoperformbasicoperationaltasks,butwithouttheabilitytolookatuser