oracle表空间使用率统计查询

参考文献

文献1：http://blog.itpub.net/24104518/viewspace-730682，字符有格式，需要清理一下

文献2：http://www.cnblogs.com/fengyun627/archive/2009/07/27/1532551.html

文献3：http://blog.csdn.net/hproc/article/details/7372265

sql语句格式化：http://web.chacuo.net/formatsql

背景

今天发现有一张采样表从1月5号开始不记录数据了，所以想查看一下表空间使用率，在网上零零散散找了很多资料，现在记录如下，也不知道哪一个最准确。还有一个就是网上拷贝的sql代码格式太乱了，不好看，找到一个在线格式化工具。

参考1

--查询表空间使用情况

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



--查询表空间的free space

select tablespace_name, count(*) AS extends,round(sum(bytes) / 1024 / 1024, 2) AS MB,sum(blocks) AS blocks from dba_free_space group BY tablespace_name;



--查询表空间的总容量

select tablespace_name, sum(bytes) / 1024 / 1024 as MB from dba_data_files group by tablespace_name;

--查询表空间使用率

SELECT total.tablespace_name,

       Round(total.MB, 2)           AS Total_MB,

       Round(total.MB - free.MB, 2) AS Used_MB,

       Round(( 1 - free.MB / total.MB ) * 100, 2)

       || '%'                       AS Used_Pct

FROM   (SELECT tablespace_name,

               Sum(bytes) / 1024 / 1024 AS MB

        FROM   dba_free_space

        GROUP  BY tablespace_name) free,

       (SELECT tablespace_name,

               Sum(bytes) / 1024 / 1024 AS MB

        FROM   dba_data_files

        GROUP  BY tablespace_name) total

WHERE  free.tablespace_name = total.tablespace_name;

上述语句查询结果如下图所示：

 

参考2：

SELECT a.tablespace_name                        "表空间名",

       total                                    "表空间大小",

       free                                     "表空间剩余大小",

       ( total - free )                         "表空间使用大小",

       Round(( total - free ) / total, 4) * 100 "使用率   %"

FROM   (SELECT tablespace_name,

               Sum(bytes) free

        FROM   DBA_FREE_SPACE

        GROUP  BY tablespace_name) a,

       (SELECT tablespace_name,

               Sum(bytes) total

        FROM   DBA_DATA_FILES

        GROUP  BY tablespace_name) b

WHERE  a.tablespace_name = b.tablespace_name

查询结果

 

参考3

SELECT TABLESPACE_NAME "表空间",

       To_char(Round(BYTES / 1024, 2), '99990.00')

       || ''           "实有",

       To_char(Round(FREE / 1024, 2), '99990.00')

       || 'G'          "现有",

       To_char(Round(( BYTES - FREE ) / 1024, 2), '99990.00')

       || 'G'          "使用",

       To_char(Round(10000 * USED / BYTES) / 100, '99990.00')

       || '%'          "比例"

FROM   (SELECT A.TABLESPACE_NAME                             TABLESPACE_NAME,

               Floor(A.BYTES / ( 1024 * 1024 ))              BYTES,

               Floor(B.FREE / ( 1024 * 1024 ))               FREE,

               Floor(( A.BYTES - B.FREE ) / ( 1024 * 1024 )) USED

        FROM   (SELECT TABLESPACE_NAME TABLESPACE_NAME,

                       Sum(BYTES)      BYTES

                FROM   DBA_DATA_FILES

                GROUP  BY TABLESPACE_NAME) A,

               (SELECT TABLESPACE_NAME TABLESPACE_NAME,

                       Sum(BYTES)      FREE

                FROM   DBA_FREE_SPACE

                GROUP  BY TABLESPACE_NAME) B

        WHERE  A.TABLESPACE_NAME = B.TABLESPACE_NAME)

--WHERE TABLESPACE_NAME LIKE 'CDR%' --这一句用于指定表空间名称

ORDER  BY Floor(10000 * USED / BYTES) DESC;

查询结果

 

 

select tablespace_name,

       max_gb,

       used_gb,

       round(100 * used_gb / max_gb) pct_used

  from (select a.tablespace_name tablespace_name,

               round((a.bytes_alloc - nvl(b.bytes_free, 0)) / power(2, 30),

                     2) used_gb,

               round(a.maxbytes / power(2, 30), 2) max_gb

          from (select f.tablespace_name,

                       sum(f.bytes) bytes_alloc,

                       sum(decode(f.autoextensible,

                                  'YES',

                                  f.maxbytes,

                                  'NO',

                                  f.bytes)) maxbytes

                  from dba_data_files f

                 group by tablespace_name) a,

               (select f.tablespace_name, sum(f.bytes) bytes_free

                  from dba_free_space f

                 group by tablespace_name) b

         where a.tablespace_name = b.tablespace_name(+)

        union all

        select h.tablespace_name tablespace_name,

               round(sum(nvl(p.bytes_used, 0)) / power(2, 30), 2) used_gb,

               round(sum(decode(f.autoextensible,

                                'YES',

                                f.maxbytes,

                                'NO',

                                f.bytes)) / power(2, 30),

                     2) max_gb

          from v$temp_space_header h, v$temp_extent_pool p, dba_temp_files f

         where p.file_id(+) = h.file_id

           and p.tablespace_name(+) = h.tablespace_name

           and f.file_id = h.file_id

           and f.tablespace_name = h.tablespace_name

         group by h.tablespace_name)

order by 4;