Oracle表空间

1.  查看表空间使用情况：

    SELECT tbs 表空间名,                                   

    sum(totalM) 总共大小M,                                   

    sum(usedM) 已使用空间M,                                   

    sum(remainedM) 剩余空间M,                                   

    sum(usedM)/sum(totalM)*100 已使用百分比,                           

    sum(remainedM)/sum(totalM)*100 剩余百分比                           

    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)))/1024/1024usedM,                       

     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_filesb                           

     WHERE a.file_id = b.file_id                               

     GROUP BYb.tablespace_name,b.file_name,b.file_id,b.bytes                    

     ORDER BY b.tablespace_name                               

    )                                           

    GROUP BY tbs    

2. 扩展表空间

（1）添加表空间文件

语法：

  alter tablespace表空间名称

  add datafile表空间存放路径  size 表空间大小 autoextend on next增长的大小 maxsize 空间最大值(如果不限制空间最大值就用unlimited)

 例如：

    altertablespace vgsm
    add datafile'c:\oracle\product\10.2.0\oradata\vgsm\vgsm_01.dbf'
    size 1024M autoextend on next 50M maxsize unlimited;

（2）修改表空间文件大小

alterdatabase datafile 'D:\Oracle\PRODUCT\ORADATA\TEST\USERS01.DBF' resize 50m;