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Oracle中sys和system的区别小结

程序员文章站 2023-11-17 11:19:58
1. 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...
1.
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sys schema

(4)sysdba比sysoper多了一个create database的权限
3.
sysdba
perform startup and shutdown operations
alter database: open, mount, back up, or change character set
create database
create spfile
archivelog and recovery
includes the restricted session privilege
effectively, this system privilege allows a user to connect as user sys.
sysoper
perform startup and shutdown operations
create spfile
alter database open/mount/backup
archivelog and recovery
includes the restricted session privilege
this privilege allows a user to perform basic operational tasks, but without the ability to look at user data