参考文献
文献1：，字符有格式，需要清理一下
文献2：
文献3：
sql语句格式化：
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) DWHERE D.TABLESPACE_NAME = F.TABLESPACE_NAMEORDER BY 1--查询表空间的free spaceselect 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_PctFROM (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) totalWHERE 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) bWHERE 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;
本文转自xwdreamer博客园博客，原文链接：http://www.cnblogs.com/xwdreamer/p/3511047.html，如需转载请自行联系原作者