Oracle SQL*PLUS与用户操作相关的常用命令

1.增加数据库用户：(user01/pwd)

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create user user01

identified by pwd

default tablespace users

Temporary TABLESPACE Temp;

2.给用户user01授权:

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grant connect,resource,dba to user01;

grant sysdba to user01;

commit;

3.删除用户：

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drop user user01;

4.解锁用户：

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alter user scott account unlock;

5.修改用户密码：

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alter user scott identified by tiger;

6.显示当前连接用户：

方法1：SHOW USER

方法2：SELECT USER FROM dual;

7.切换连接用户：
切换成普通用户：conn scott/tiger;
切换成DBA用户：conn sys/密码 AS SYSDBA;
（conn 可以用“connect”替换）

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8.通过DBA用户连接数据库后，可以从dba_users视图中查询得到Oracle用户的口令加密串：

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SQL> select username,password from dba_users where username='SYS';

9.查看属于某用户创建的表或字段(记得用户名要大写)：
拥有表：

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select table_name from all_tables where owner = 'SCOTT';

字段：

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select table_name, column_name, data_type

from all_tab_columns

where owner = 'SCOTT'

and table_name = 'DEPT';

10.显示当前连接用户默认表空间：

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select username,default_tablespace from user_users;

(在PL/SQL Developer上显示可能会不准确)

11.查看当前库的所有数据表：

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SQL> select TABLE_NAME from all_tables;