oracle中真实表空间大小

Question

我需要知道 Oracle 中的真实表空间大小。我有一些表空间，我需要知道它现在使用了多少空间以及有多少空间是可用的（也许是可用空间的百分比）。我在网上发现了一些sql，但它们都显示了基于水印的大小...这不是现在分配的真实空间，但据我所知，已经达到的最高值... 所以我真正需要的是知道我是否有足够的空间来容纳不断写入的数据，并且我必须知道在必须删除其中一些数据之前可以存储多少数据。

谢谢

Answer 1

试试这个：

-- Available space, by tablespace

SELECT * FROM
  (SELECT tablespace_name FROM dba_tablespaces)
LEFT OUTER JOIN
  (SELECT tablespace_name, SUM(bytes) AS total_bytes
     FROM dba_data_files
     GROUP BY tablespace_name)
  USING (tablespace_name)
LEFT OUTER JOIN
  (SELECT tablespace_name, sum(bytes) AS used_bytes
     from dba_segments
     GROUP BY tablespace_name)
  USING (tablespace_name)
LEFT OUTER JOIN
  (SELECT tablespace_name, SUM(bytes) AS free_bytes
     FROM dba_free_space
     GROUP BY tablespace_name)
  USING (tablespace_name);

Answer 2

如果您想了解数据文件大小（包括那些可以自动扩展的文件），请尝试：

SELECT DISTINCT a.tablespace_name,
            sum(a.bytes)/1024/1024 CurMb,
            sum(decode(b.maxextend, null, a.bytes/1024/1024, b.maxextend*(SELECT value FROM v$parameter WHERE name='db_block_size')/1024/1024)) MaxMb,
            round(100*(sum(a.bytes)/1024/1024 - round(c.free/1024/1024))/(sum(decode(b.maxextend, null, a.bytes/1024/1024, b.maxextend*(SELECT value FROM v$parameter WHERE name='db_block_size')/1024/1024)))) UPercent,
            (sum(a.bytes)/1024/1024 - round(c.free/1024/1024)) TotalUsed,
            (sum(decode(b.maxextend, null, a.bytes/1024/1024, b.maxextend*(SELECT value FROM v$parameter WHERE name='db_block_size')/1024/1024)) - (sum(a.bytes)/1024/1024 - round(c.Free/1024/1024))) TotalFree 
FROM dba_data_files a,
   sys.filext$ b,
   (SELECT d.tablespace_name , sum(nvl(c.bytes,0)) free
     FROM dba_tablespaces d,dba_free_space c
     WHERE d.tablespace_name = c.tablespace_name(+) 
     GROUP BY d.tablespace_name) c
WHERE a.file_id = b.file#(+)
    AND a.tablespace_name = c.tablespace_name  
GROUP BY a.tablespace_name,
       c.free/1024

Answer 3

希望这会对您有所帮助，

 SELECT a.tablespace_name, a.file_name, a.bytes allocated_bytes,b.free_bytes FROM dba_data_files a,
(SELECT file_id, SUM(bytes) free_bytes FROM dba_free_space b GROUP BY file_id) b WHERE a.file_id=b.file_id
ORDER BY a.tablespace_name;