找出表空间的可用空间

Question

我们的应用程序失败了几次,因为'ORA-01536:超出了表空间的空间配额',我们希望能够通过定期检查表空间上的可用空间并在低于某个级别时发出警报来防止这种情况发生. .

有没有办法找出表空间中剩余多少可用空间？

经过一些研究(我不是DBA),我尝试了以下方法:

select max_bytes-bytes from user_ts_quotas;

select sum(nvl(bytes,0)) from user_free_space;

但那些查询会返回完全不同的结果.

Answer 1

我用这个查询

column "Tablespace" format a13
column "Used MB"    format 99,999,999
column "Free MB"    format 99,999,999
column "Total MB"   format 99,999,999
select
   fs.tablespace_name                          "Tablespace",
   (df.totalspace - fs.freespace)              "Used MB",
   fs.freespace                                "Free MB",
   df.totalspace                               "Total MB",
   round(100 * (fs.freespace / df.totalspace)) "Pct. Free"
from
   (select
      tablespace_name,
      round(sum(bytes) / 1048576) TotalSpace
   from
      dba_data_files
   group by
      tablespace_name
   ) df,
   (select
      tablespace_name,
      round(sum(bytes) / 1048576) FreeSpace
   from
      dba_free_space
   group by
      tablespace_name
   ) fs
where
   df.tablespace_name = fs.tablespace_name;

Answer 2

更准确的SQL语句

SELECT  a.tablespace_name,
    ROUND (((c.BYTES - NVL (b.BYTES, 0)) / c.BYTES) * 100,2) percentage_used,
    c.BYTES / 1024 / 1024 space_allocated,
    ROUND (c.BYTES / 1024 / 1024 - NVL (b.BYTES, 0) / 1024 / 1024,2) space_used,
    ROUND (NVL (b.BYTES, 0) / 1024 / 1024, 2) space_free, 
    c.DATAFILES
  FROM dba_tablespaces a,
       (    SELECT   tablespace_name, 
                  SUM (BYTES) BYTES
           FROM   dba_free_space
       GROUP BY   tablespace_name
       ) b,
      (    SELECT   COUNT (1) DATAFILES, 
                  SUM (BYTES) BYTES, 
                  tablespace_name
           FROM   dba_data_files
       GROUP BY   tablespace_name
    ) c
  WHERE b.tablespace_name(+) = a.tablespace_name 
    AND c.tablespace_name(+) = a.tablespace_name
ORDER BY NVL (((c.BYTES - NVL (b.BYTES, 0)) / c.BYTES), 0) DESC;

Answer 3

有很多方法可以检查大小,但作为一个开发人员,我们没有太多访问查询元表,我发现这个解决方案非常简单(注意:如果你收到错误消息ORA-01653'因为ORA-01653错误是由于你需要为表空间添加空间.')

--Size of All Table Space

--1. Used Space
SELECT TABLESPACE_NAME,TO_CHAR(SUM(NVL(BYTES,0))/1024/1024/1024, '99,999,990.99') AS "USED SPACE(IN GB)" FROM USER_SEGMENTS GROUP BY TABLESPACE_NAME
--2. Free Space
SELECT TABLESPACE_NAME,TO_CHAR(SUM(NVL(BYTES,0))/1024/1024/1024, '99,999,990.99') AS "FREE SPACE(IN GB)" FROM   USER_FREE_SPACE GROUP BY TABLESPACE_NAME

--3. Both Free & Used
SELECT USED.TABLESPACE_NAME, USED.USED_BYTES AS "USED SPACE(IN GB)",  FREE.FREE_BYTES AS "FREE SPACE(IN GB)"
FROM
(SELECT TABLESPACE_NAME,TO_CHAR(SUM(NVL(BYTES,0))/1024/1024/1024, '99,999,990.99') AS USED_BYTES FROM USER_SEGMENTS GROUP BY TABLESPACE_NAME) USED
INNER JOIN
(SELECT TABLESPACE_NAME,TO_CHAR(SUM(NVL(BYTES,0))/1024/1024/1024, '99,999,990.99') AS FREE_BYTES FROM  USER_FREE_SPACE GROUP BY TABLESPACE_NAME) FREE
ON (USED.TABLESPACE_NAME = FREE.TABLESPACE_NAME);

谢谢

Answer 4

这是我遇到的最简单的查询之一,我们也将它用于监控:

SELECT TABLESPACE_NAME,SUM(BYTES)/1024/1024/1024 "FREE SPACE(GB)"
FROM DBA_FREE_SPACE GROUP BY TABLESPACE_NAME;

有关Oracle Tablespace的完整文章: 表空间

Answer 5

这也不错

clear breaks
clear computes

Prompt
Prompt Tablespace Usage
Prompt

SET lines 120 pages 500 
col percent_used format 999.99

SELECT a.TABLESPACE_NAME,
  NVL(ROUND((a.BYTES  /1024)/1024/1024,2),2) GB_TOTAL,
  NVL(ROUND((b.BYTES  /1024)/1024/1024,2),2) GB_FREE,
  NVL(ROUND((b.largest/1024),2),0) KB_Chunk,
  NVL(ROUND(((a.BYTES -NVL(b.BYTES,1))/a.BYTES)*100,4),0) percent_used
FROM
  (SELECT TABLESPACE_NAME,
    NVL(SUM(BYTES),0) BYTES
  FROM dba_data_files
  GROUP BY TABLESPACE_NAME
  ) a,
  (SELECT TABLESPACE_NAME,
    NVL(SUM(BYTES),1) BYTES ,
    NVL(MAX(BYTES),1) largest
  FROM dba_free_space
  GROUP BY TABLESPACE_NAME
  ) b
WHERE a.TABLESPACE_NAME=b.TABLESPACE_NAME(+)
ORDER BY ((a.BYTES-b.BYTES)/a.BYTES) DESC;

输出

TABLESPACE_NAME                  GB_TOTAL    GB_FREE   KB_CHUNK PERCENT_USED
------------------------------ ---------- ---------- ---------- ------------
SYSTEM                                .84        .02       9216        97.36
SYSAUX                                .57        .05      32768        91.10
UNDOTBS1                              .06        .05      36864        23.13
USERS                                   0          0       4096        20.00