Oracle用户类型区别
Oracle用户类型区别，SYS用户是Oracle中的超级用户，主要用于维护系统信息和管理实例，数据库中数据字典的所有表和视图都存储在S
（1）在一台计算机中可以安装多个Oralce数据库
(实例），它们的SID不能相同
（2）但是在不同的计算机中，可以安装多个相同
SID的Oracle数据库（实例)
（3）在同一个网络中，多个Oracle数据库的
全局数据库名一定不能相同
（4）全局数据库的命名方式：
SID.域名(家庭的名字，家庭的户主名字)
(一个家庭里面小孩子的名字)
（5）SYS用户
SYS用户是Oracle中的超级用户，主要用于维护系统信息和管理实例，数据库中数据字典的所有表和视图都存储在SYS模式中
SYSTEM用户
SYSTEM用户是Oracle中默认的管理员，，它拥有DBA权限。该用户拥有Oracle管理工具使用的内部表和视图，通常通过SYSTEM用户管理Oracle数据库的用户、权限和存储等
SCOTT用户
SCOTT是Oracle数据库的一个示范账号
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