oracle表空间使用率统计查询

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：/article/5355387.html

文献3：/article/9594650.html

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;