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;