转自 http://www.cnblogs.com/xwdreamer/p/3511047.html

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;

oracle表空间使用率统计查询

转自 http://www.cnblogs.com/xwdreamer/p/3511047.html

参考文献

背景

参考1

参考2：

参考3