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查看用户和默认表空间的关系。
select username,default_tablespace from dba_users;
1.查看表结构:desc表名
2.查看当前用户的表:
select table_name from user_tables;
3.查看所有用户的表名:
select table_name from all_tables;
4.查看所有表名(其中包括系统表)
select table_name from all_tables;
5.查看所有的表:
下面介绍Oracle查询用户表空间◆Oracle查询用户表空间:select * from user_all_tables◆Oracle查询所有函数和储存过程:select * from user_source◆Oracle查询所有用户:select * from all_users.select * from dba_users◆Oracle查看当前用户连接:select * from v$Session◆Oracle查看当前用户权限:select * from session_privs◆Oracle查看用户表空间使用情况: select a.file_id "FileNo",a.tablespace_name "Tablespace_name", a.bytes "Bytes",a.bytes-sum(nvl(b.bytes,0)) "Used", sum(nvl(b.bytes,0)) "Free", sum(nvl(b.bytes,0))/a.bytes*100 "%free" from dba_data_files a, dba_free_space b where a.file_id=b.file_id(+) group by a.tablespace_name , a.file_id,a.bytes order by a.tablespace_name; 1.查看所有用户: select * from dba_user; select * from all_users; select * from user_users;2.查看用户系统权限: select * from dba_sys_privs; select * from all_sys_privs; select * from user_sys_privs;3.查看用户对象权限: select * from dba_tab_privs; select * from all_tab_privs; select * from user_tab_privs;4.查看所有角色: select * from dba_roles;5.查看用户所拥有的角色: select * from dba_role_privs; select * from user_role_privs; 6.查看角色所拥有的权限: select * from role_sys_privs; select * from role_tab_privs; 7.查看所有系统权限 select * from system_privilege_map; 8.查看所有对象权限 select * from table_privilege_map; 以上是在Oracle中查看用户权限 ,在DB2中为: select * from syscat.dbauth 或者 get authorizations 查看sid select * from v$instance ==================================
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