--1、查看錶在那個表空間

  select tablespace_name,table_name from user_talbes where table_name='test';
--2、獲取使用者的預設表空間

  select   username,   DEFAULT_TABLESPACE     from   dba_users where username='MXH';
--3、查看錶空間所有的檔案  

  select * from dba_data_files where tablespace_name='USERS';
--4、查看錶空間使用情況：
    SELECT tbs 表空間名,                                    
    sum

(totalM) 總共大小M,                                    
    sum(usedM) 已使用空間M,                                    
    sum(remainedM) 剩餘空間M,                                    
    sum(usedM)/sum(totalM)*100 已使用百分比,                            
    sum(remainedM)/sum(totalM)*100 剩餘百分比                            
    FROM(                                            
     SELECT b.file_id ID,                                    
     b.tablespace_name tbs,                                    
     b.file_name name,                                    
     b.bytes/1024/1024 totalM,                                    
     (b.bytes-sum(nvl(a.bytes,0)))/1024/1024 usedM,                        
     sum(nvl(a.bytes,0)/1024/1024) remainedM,                            
     sum(nvl(a.bytes,0)/(b.bytes)*100),                                
     (100 - (sum(nvl(a.bytes,0))/(b.bytes)*100))                            
     FROM dba_free_space a,dba_data_files b                            
     WHERE a.file_id = b.file_id                                
     GROUP BY b.tablespace_name,b.file_name,b.file_id,b.bytes                    
     ORDER BY b.tablespace_name                                
    )                                            
    GROUP BY tbs                                        
                                                
--5、擴充套件表空間 

  alterdatabase datafile 'D:\ORACLE\PRODUCT\ORADATA\TEST\USERS01.DBF' resize 50m;
  --自動增長  

  alterdatabase datafile 'D:\ORACLE\PRODUCT\ORADATA\TEST\USERS01.DBF' autoextend onnext 50m maxsize 500m;    
  --增加資料檔案

   alter tablespace USERS add datafile 'd:\users02.dbf' size 5m;