orabbix插件监控oracle表空间问题

Posted 2020-10-31 Louis He

 我们安装好orabbix插件后，查看Tablespaces监控项是发项值为none，第一反应是没监控成功，其实不然。

1、我们打开orabbix监控项参数的路径，下面为Tablespaces的sql代码

[root@-svr1 ~]# vim /opt/orabbix/conf/query.props

select \'- Tablespace ->\',t.tablespace_name ktablespace, \\
       \'- Type->\',substr(t.contents, 1, 1) tipo, \\
       \'- Used(MB)->\',trunc((d.tbs_size-nvl(s.free_space, 0))/1024/1024) ktbs_em_uso, \\
       \'- ActualSize(MB)->\',trunc(d.tbs_size/1024/1024) ktbs_size, \\
       \'- MaxSize(MB)->\',trunc(d.tbs_maxsize/1024/1024) ktbs_maxsize, \\
       \'- FreeSpace(MB)->\',trunc(nvl(s.free_space, 0)/1024/1024) kfree_space, \\
       \'- Space->\',trunc((d.tbs_maxsize - d.tbs_size + nvl(s.free_space, 0))/1024/1024) kspace, \\
       \'- Perc->\',decode(d.tbs_maxsize, 0, 0, trunc((d.tbs_size-nvl(s.free_space, 0))*100/d.tbs_maxsize)) kperc \\
from \\
  ( select SUM(bytes) tbs_size, \\
           SUM(decode(sign(maxbytes - bytes), -1, bytes, maxbytes)) tbs_maxsize, tablespace_name tablespace \\
    from ( select nvl(bytes, 0) bytes, nvl(maxbytes, 0) maxbytes, tablespace_name \\
    from dba_data_files \\
    union all \\
    select nvl(bytes, 0) bytes, nvl(maxbytes, 0) maxbytes, tablespace_name \\
    from dba_temp_files \\
    ) \\
    group by tablespace_name \\
    ) d, \\
    ( select SUM(bytes) free_space, \\
    tablespace_name tablespace \\
    from dba_free_space \\
    group by tablespace_name \\
    ) s, \\
    dba_tablespaces t \\
    where t.tablespace_name = d.tablespace(+) and \\
    t.tablespace_name = s.tablespace(+) \\
    order by 8) \\
    where kperc > 93 \\
    and tipo <>\'T\' \\
    and tipo <>\'U\'
tbl_space.NoDataFound=none

这个SQL会返回93%满的表空间信息，而对应这个监控项，orabbix也定义了触发器，因为监控项的返回值是文本，而没有满足条件的记录时返回字符串“none“，所以监控项对应的触发器会检查返回值开头是不是none，如果不是，就报警，这样，用户除了收到预警信息，还能从返回值的具体值中看到具体时哪个表空间快满了。

改为3%后测试结果：

当然，大部分时间监控项会返回none，所以我们无法画出正常未满的表空间的空间占用时间曲线。只有超过93%慢时，我们才知道具体的占用情况。

如果想收集并保留更多信息，就需要使用自定义查询，方法就是在query.props文件中加入你想检查的SQL，比如我们想了解表空间信息，就加以下SQL：

customtbl.Query=select \'TBL:\'||a.tablespace_name||\',\' TBL, \\

\'Total Size:\'||trunc(sum(a.tots) / 1024 / 1024, 2)||\',\' Tot_Size_mb, \\

\'Free MB:\'||round(sum(a.sumb) / 1024 / 1024, 2)||\',\' Tot_Free_mb, \\

\'PCT Free:\'||round(sum(a.sumb) * 100 / sum(a.tots), 2)||\',\' Pct_Free, \\

\'Max Free MB:\'||round(sum(a.largest) / 1024 / 1024, 2)||\',\' Max_Free_mb, \\

\'Chunks Free:\'||sum(a.chunks)||\',\' Chunks_Free \\

from (select tablespace_name, \\

0 tots, \\

sum(bytes) sumb, \\

max(bytes) largest, \\

count(*) chunks \\

from dba_free_space a \\

group by tablespace_name \\

union \\

select tablespace_name, sum(bytes) tots, 0, 0, 0 \\

from dba_data_files \\

group by tablespace_name) a \\

group by a.tablespace_name

customtbl.NoDataFound=none