Oracle中sys和system的区别小结

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

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