查看用戶和默認表空間的關係。
select username,default_tablespace from dba_users;
1.查看錶結構:desc表名
2.查看當前用戶的表:
select table_name from user_tables;
3.查看所有用戶的表名:
select table_name from all_tables;
4.查看所有表名(其中包括系統表)
select table_name from all_tables;
5.查看所有的表:
select * from tab/dba_tables/dba_objects/cat;
下面介紹Oracle查詢用戶表空間
◆Oracle查詢用戶表空間:select * fromuser_all_tables
◆Oracle查詢所有函數和儲存過程:select * fromuser_source
◆Oracle查詢所有用戶:select * fromall_users.select * from dba_users
◆Oracle查看當前用戶連接:select * fromv$Session
◆Oracle查看當前用戶權限:select * fromsession_privs
◆Oracle查看用戶表空間使用情況:
select a.file_id "FileNo",a.tablespace_name
"Tablespace_name",
a.bytes "Bytes",a.bytes-sum(nvl(b.bytes,0)) "Used",
sum(nvl(b.bytes,0)) "Free",
sum(nvl(b.bytes,0))/a.bytes*100 "%free"
from dba_data_files a, dba_free_space b
where a.file_id = b .file_id(+)
group by a.tablespace_name ,
a.file_id,a.bytes order by a.tablespace_name;
1、查看所有用戶:
select * from dba_user;
select * from all_users;
select * from user_users;
2、查看用戶系統權限:
select * from dba_sys_privs;
select * from all_sys_privs;
select * from user_sys_privs;
3、查看用戶對象權限:
select * from dba_tab_privs;
select * from all_tab_privs;
select * from user_tab_privs;
4、查看所有角色:
select * from dba_roles;
5、查看用戶所擁有的角色:
select * from dba_role_privs;
select * from user_role_privs;
6、查看角色所擁有的權限:
select * from role_sys_privs;
select * from role_tab_privs;
7、查看所有系統權限
select * from system_privilege_map;
8、查看所有對象權限
select * from table_privilege_map;
以上是在Oracle中查看用戶權限 ,
在DB2中爲:
select * from syscat.dbauth
或者
get authorizations
查看sid
select * from v$instance