查看当前用户的缺省表空间
  SQL>select username,default_tablespace from user_users;

   查看当前用户的角色
   SQL>select * from user_role_privs;

   查看当前用户的系统权限和表级权限
      SQL>select * from user_sys_privs;
      SQL>select * from user_tab_privs;          
      查看用户下所有的表
      SQL>select * from user_tables;
      显示用户信息(所属表空间)
      select default_tablespace,temporary_tablespace from dba_users where username='GAME';

            1、用户           
      查看当前用户的缺省表空间           
      SQL>select username,default_tablespace from user_users;           
      查看当前用户的角色           
      SQL>select * from user_role_privs;           
      查看当前用户的系统权限和表级权限           
      SQL>select * from user_sys_privs;           
      SQL>select * from user_tab_privs;
      显示当前会话所具有的权限
      SQL>select * from session_privs;
      显示指定用户所具有的系统权限
      SQL>select * from dba_sys_privs where grantee='GAME';
      显示特权用户
      select * from v$pwfile_users;
      显示用户信息(所属表空间)
      select default_tablespace,temporary_tablespace from dba_users where username='GAME';
      显示用户的PROFILE
      select profile from dba_users where username='GAME'; 
    

     2、表           
      查看用户下所有的表           
      SQL>select * from user_tables;           
      查看名称包含log字符的表           
      SQL>select object_name,object_id from user_objects where instr(object_name,'LOG')>0;           
      查看某表的创建时间           
      SQL>select object_name,created from user_objects where object_name=upper('&table_name');           
      查看某表的大小           
      SQL>select sum(bytes)/(1024*1024) as "size(M)" from user_segments   where segment_name=upper('&table_name');           
      查看放在ORACLE的内存区里的表           
      SQL>select table_name,cache from user_tables where instr(cache,'Y')>0; 
    

     3、索引           
      查看索引个数和类别           
      SQL>select index_name,index_type,table_name from user_indexes order by table_name;          
      查看索引被索引的字段           
      SQL>select * from user_ind_columns where index_name=upper('&index_name');           
      查看索引的大小           
      SQL>select sum(bytes)/(1024*1024) as "size(M)" from user_segments     where segment_name=upper('&index_name');   
    
    
     4、序列号      
      查看序列号，last_number是当前值           
      SQL>select * from user_sequences;  
    
     5、视图           
      查看视图的名称          
      SQL>select view_name from user_views;           
      查看创建视图的select语句           
      SQL>set view_name,text_length from user_views;           
      SQL>set long 2000;                说明：可以根据视图的text_length值设定set long 的大小           
      SQL>select text from user_views where view_name=upper('&view_name');   
    
     6、同义词           
      查看同义词的名称           
      SQL>select * from user_synonyms;   
     
     7、约束条件           
      查看某表的约束条件           
      SQL>select constraint_name, constraint_type,search_condition, r_constraint_name  from user_constraints where table_name = upper('&table_name');           
      SQL>select c.constraint_name,c.constraint_type,cc.column_name  from user_constraints c,user_cons_columns cc                where c.owner = upper('&table_owner') and c.table_name = upper('&table_name')  and c.owner = cc.owner and c.constraint_name = cc.constraint_name order by cc.position;  
    
     8、存储函数和过程           
      查看函数、过程、触发器的状态  
      SQL>select object_name,status from user_objects where object_type='FUNCTION';           
      SQL>select object_name,status from user_objects where object_type='PROCEDURE'; 
      SQL>select object_name,status from user_objects where object_type='TRIGGER';
      查看函数和过程的源代码          
      SQL>select text from all_source where owner=user and name=upper('&plsql_name');

thit's ok!