Oacle 사용자 보기

-             
select username,default_tablespace from dba_users;
--           
select * from user_tables; 
--Oracle     
select * from user_all_tables;

--Oracle      
select * from user_views;
--           ：
select * from user_source;
--      ：
select * from all_users;
--select * from dba_users
--        ：
select * from v$Session;
--      
SELECT * FROM USER_ROLE_PRIVS;
--        ：
select * from session_privs;
--            
SELECT * FROM DBA_ROLE_PRIVS;
--      
select * from dba_roles;
--      
SELECT NAME FROM V$DATABASE;
--           
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;