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  select   t.tablespace_name,   round(sum(bytes/(1024*1024)),0)   ts_size  
  from   dba_tablespaces   t,   dba_data_files   d  
  where   t.tablespace_name   =   d.tablespace_name  
  group   by   t.tablespace_name;  
   
  2¡¢²é¿´±í¿Õ¼äÎïÀíÎļþµÄÃû³Æ¼°´óС  
   
  select   tablespace_name,   file_id,   file_name,  
  round(bytes/(1024*1024),0)   total_space  
  from   dba_data_files  
  order   by   tablespace_name;  
   
  3¡¢²é¿´»Ø¹ö¶ÎÃû³Æ¼°´óС  
   
  select   segment_name,   tablespace_name,   r.status,    
  (initial_extent/1024)   InitialExtent,(next_extent/1024)   NextExtent,    
  max_extents,   v.curext   CurExtent  
  from   dba_rollback_segs   r,   v$rollstat   v  
  Where   r.segment_id   =   v.usn(+)  
  order   by   segment_name   ;  
   
  4¡¢²é¿´¿ØÖÆÎļþ  
   
  select   name   from   v$controlfile;  
   
  5¡¢²é¿´ÈÕÖ¾Îļþ  
   
  select   member   from   v$logfile;  
   
  6¡¢²é¿´±í¿Õ¼äµÄʹÓÃÇé¿ö  
   
  select   sum(bytes)


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ROW_NUMBER
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OracleÊý¾Ýµ¼Èëµ¼³öimp/exp¾ÍÏ൱ÓÚoracleÊý¾Ý»¹Ô­Ó뱸·Ý¡£expÃüÁî¿ÉÒÔ°ÑÊý¾Ý´ÓÔ¶³ÌÊý¾Ý¿â·þÎñÆ÷µ¼³öµ½±¾µØµÄdmpÎļþ£¬impÃüÁî¿ÉÒÔ°ÑdmpÎļþ´Ó±¾µØµ¼Èëµ½Ô¶´¦µÄÊý¾Ý¿â·þÎñÆ÷ÖС£ ÀûÓÃÕâ¸ö¹¦ÄÜ¿ÉÒÔ¹¹½¨Á½¸öÏàͬµÄÊý¾Ý¿â£¬Ò»¸öÓÃÀ´²âÊÔ£¬Ò»¸öÓÃÀ´ÕýʽʹÓá£
 
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¡¡¡¡select * from v$version;
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¡¡¡¡select sum(bytes)/(1024*1024) as free_space,tablespace_name
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Oracle TNSLSNR Full Client

Most of admins neglect setting password on TNSlsnr Clients for Oracle databases. Oracle ensures that you can either connect to TNSlsnr on a localhost or through mapping to a remote Oracle database using .ora files.
This is not the case anymore Based on Jwa perl client.
This client is a FULL clie ......
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