ORACLE查看数据文件包含哪些对象

在上篇ORACLE查看表空间对象中，我介绍了如何查询一个表空间有那些数据库对象，那么我们是否可以查看某个数据文件包含那些数据库对象呢？如下所示

SELECT  E.SEGMENT_TYPE          AS SEGMENT_TYPE
      , E.SEGMENT_NAME          AS SEGMENT_NAME
      , F.FILE_NAME             AS FILE_NAME
      , SUM(E.BYTES)/1024/1024  AS SEGMENT_SIZE
FROM DBA_EXTENTS E
INNER JOIN DBA_DATA_FILES F ON E.FILE_ID= F.FILE_ID
WHERE F.FILE_ID =109
GROUP BY  E.SEGMENT_TYPE,E.SEGMENT_NAME,F.FILE_NAME
ORDER BY 4 DESC;

 

SELECT  E.SEGMENT_TYPE          AS SEGMENT_TYPE
      , E.SEGMENT_NAME          AS SEGMENT_NAME
      , F.FILE_NAME             AS FILE_NAME
      , SUM(E.BYTES)/1024/1024  AS SEGMENT_SIZE
FROM DBA_EXTENTS E
INNER JOIN DBA_DATA_FILES F ON E.FILE_ID= F.FILE_ID
WHERE F.FILE_NAME =&FILE_NAME
GROUP BY  E.SEGMENT_TYPE,E.SEGMENT_NAME,F.FILE_NAME
ORDER BY 4 DESC;

错误的写法，如下所示，DBA_SEGMENTS的HEADER_FILE表示ID of the file containing the segment header，主要是因为仅仅包含段对象的段头所在的文件。

SELECT ds.OWNER                  AS OWNER
      ,df.FILE_NAME              AS FILE_NAME
      ,ds.SEGMENT_NAME           AS SEGMENT_NAME
      ,ds.SEGMENT_TYPE           AS SEGMENT_TYPE
      ,SUM(ds.BYTES)/1024/1024   AS SEGMENT_SIZE
FROM DBA_SEGMENTS ds
LEFT JOIN DBA_DATA_FILES df ON ds.HEADER_FILE = df.FILE_ID
WHERE ds.TABLESPACE_NAME=&TABLESPACE_NAME
  AND df.FILE_ID=&FILE_ID
GROUP BY OWNER,FILE_NAME,SEGMENT_NAME,SEGMENT_TYPE
ORDER BY 4;