oracle收缩表空间文件,回收磁盘存储

select b.file_id  文件ID,
  b.tablespace_name  表空间,
  'alter database datafile '''||b.file_name||''' resize '||(trunc((b.bytes-sum(nvl(a.bytes,0)))/1024/1024/1024)+1)||'g;'   物理文件名,
  b.bytes/1024/1024/1024       总字节数,
  (b.bytes-sum(nvl(a.bytes,0)))/1024/1024/1024    已使用,
  sum(nvl(a.bytes,0))/1024/1024/1024         剩余,
  sum(nvl(a.bytes,0))/(b.bytes)*100 剩余百分比
  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
having  sum(nvl(a.bytes,0))/1024/1024/1024 >5
  order by b.tablespace_name;

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