ORACLE查看表空间对象

ORACLE如何查看表空间存储了那些数据库对象呢？可以使用下面脚本简单的查询表空间存储了那些对象：

SELECT TABLESPACE_NAME       AS TABLESPACE_NAME
     , SEGMENT_NAME          AS SEGMENT_NAME
     , SUM(BYTES)/1024/1024  AS SEGMENT_SIZE
FROM DBA_SEGMENTS
WHERE TABLESPACE_NAME=&TABLESPACE_NAME
GROUP BY TABLESPACE_NAME,SEGMENT_NAME
ORDER BY 3

如果你想了解一下对象的详细信息，例如对象类型（表、索引）、对象的OWNER，可以使用下面SQL语句查询

/*查询表空间中对象的详细信息*/
SELECT OWNER                  AS OWNER
      ,SEGMENT_NAME           AS SEGMENT_NAME
      ,SEGMENT_TYPE           AS SEGMENT_TYPE
      ,SUM(BYTES)/1024/1024   AS SEGMENT_SIZE
FROM DBA_SEGMENTS
WHERE TABLESPACE_NAME=&TABLESPACE_NAME
GROUP BY OWNER,SEGMENT_NAME,SEGMENT_TYPE
ORDER BY 4;

另外，也可以通过下面SQL语句查看表空间的对象

SELECT OWNER         AS OWNER
      ,'TABLE'       AS SEGMENT_TYPE
      ,TABLE_NAME    AS SEGMENT_NAME
FROM DBA_TABLES
WHERE TABLESPACE_NAME=&TABLESPACE_NAME
UNION ALL
SELECT OWNER         AS OWNER
      ,'INDEX'       AS SEGMENT_TYPE
      ,INDEX_NAME    AS SEGMETN_NAME
FROM DBA_INDEXES
WHERE TABLESPACE_NAME=&TABLESPACE_NAME
UNION ALL
SELECT OWNER         AS OWNER
      ,'LOBSEGMENT'  AS SGEMENT_TYPE
      ,SEGMENT_NAME  AS SEGMENT_NAME
FROM DBA_LOBS
WHERE TABLESPACE_NAME=&TABLESPACE_NAME;