查询表空间使用率

SELECT Upper(F.TABLESPACE_NAME)         "表空间名",
       D.TOT_GROOTTE_MB                 "表空间大小(M)",
       D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空间(M)",
       To_char(Round(( D.TOT_GROOTTE_MB - F.TOTAL_BYTES ) / D.TOT_GROOTTE_MB * 100, 2), '990.99')
       || '%'                           "使用比",
       F.TOTAL_BYTES                    "空闲空间(M)",
       F.MAX_BYTES                      "最大块(M)"
FROM   (SELECT TABLESPACE_NAME,
               Round(Sum(BYTES) / ( 1024 * 1024 ), 2) TOTAL_BYTES,
               Round(Max(BYTES) / ( 1024 * 1024 ), 2) MAX_BYTES
        FROM   SYS.DBA_FREE_SPACE
        GROUP  BY TABLESPACE_NAME) F,
       (SELECT DD.TABLESPACE_NAME,
               Round(Sum(DD.BYTES) / ( 1024 * 1024 ), 2) TOT_GROOTTE_MB
        FROM   SYS.DBA_DATA_FILES DD
        GROUP  BY DD.TABLESPACE_NAME) D
WHERE  D.TABLESPACE_NAME = F.TABLESPACE_NAME
ORDER  BY 1

-- 包含未分配空间

SELECT
    a.tablespace_name,
    ROUND(a.bytes_alloc / 1024 / 1024, 2) AS allocated_mb,
    ROUND((a.bytes_alloc - NVL(b.bytes_free, 0)) / 1024 / 1024, 2) AS used_mb,
    ROUND(NVL(b.bytes_free, 0) / 1024 / 1024, 2) AS free_mb,
    ROUND((a.bytes_alloc - NVL(b.bytes_free, 0)) / a.bytes_alloc * 100, 2) AS used_pct,
    ROUND(a.max_bytes / 1024 / 1024, 2) AS max_mb,
    ROUND((a.bytes_alloc - NVL(b.bytes_free, 0)) / a.max_bytes * 100, 2) AS used_pct_of_max
FROM
    (
        SELECT
            f.tablespace_name,
            SUM(f.bytes) AS bytes_alloc,
            SUM(DECODE(f.autoextensible, 'YES', f.maxbytes, 'NO', f.bytes)) AS max_bytes
        FROM
            dba_data_files f
        GROUP BY
            f.tablespace_name
    ) a,
    (
        SELECT
            f.tablespace_name,
            SUM(f.bytes) AS bytes_free
        FROM
            dba_free_space f
        GROUP BY
            f.tablespace_name
    ) b
WHERE
    a.tablespace_name = b.tablespace_name(+)
ORDER BY
    a.tablespace_name;