Oracle 基礎(chǔ)知識(shí)之查看用戶，用戶權(quán)限，用戶表空間，用戶默認(rèn)表空間

1. 查看用戶和默認(rèn)表空間的對(duì)應(yīng)關(guān)系
www.linuxidc.com@ORCL> select username,default_tablespace from dba_users;

2. 查看表結(jié)構(gòu)
desc 表名

3. 查看當(dāng)前用戶的所有表
www.linuxidc.com@ORCL> select table_name from user_tables;

4. 查看所有用戶的表名
www.linuxidc.com@ORCL> select table_name from all_tables; 

5. Oracle查看用戶表空間使用情況
www.linuxidc.com@ORCL> select a.file_id "FileNo",a.tablespace_name "Tablespace_name",
  2  a.bytes "Bytes",a.bytes-sum(nvl(b.bytes,0)) "Used",
  3  sum(nvl(b.bytes,0)) "Free",
  4  sum(nvl(b.bytes,0))/a.bytes*100 "%free"
  5  from dba_data_files a, dba_free_space b
  6  where a.file_id=b.file_id(+)
  7  group by a.tablespace_name, a.file_id,a.bytes
  8  order by a.tablespace_name;

6. 查看用戶系統(tǒng)權(quán)限
www.linuxidc.com@ORCL> select * from dba_sys_privs;
www.linuxidc.com@ORCL> select * from user_sys_privs;

7. 查看用戶對(duì)象權(quán)限
www.linuxidc.com@ORCL> select * from dba_tab_privs;
www.linuxidc.com@ORCL> select * from all_tab_privs;
www.linuxidc.com@ORCL> select * from user_tab_privs;

8. 查看所有角色
www.linuxidc.com@ORCL> select * from dba_roles;

9. 查看用戶所擁有的角色
www.linuxidc.com@ORCL> select * from dba_role_privs;
www.linuxidc.com@ORCL> select * from user_role_privs;

10. 查看角色所擁有的權(quán)限
www.linuxidc.com@ORCL> select * from role_sys_privs;
www.linuxidc.com@ORCL> select * from role_tab_privs;
 
11. 查看所有系統(tǒng)權(quán)限
www.linuxidc.com@ORCL> select * from system_privilege_map;
12. 查看所有對(duì)象權(quán)限
www.linuxidc.com@ORCL> select * from table_privilege_map;

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