在使用监控系统报警的时候，如果显示的报警信息为纯粹的文本，会枯燥很多，而且看起来很不清晰。
比如我们要监控表空间的使用情况，输出列有表空间名，状态，区管理方式，总共的空间，使用的空间，剩余的空间等。
如果显示成下面的形式，尽管在输出中尝试使结果看起来清晰一些，但是还是事与愿违。
showtsps：Tablespace: TEST_INDEX-->Status: OLN-->Ext_MGR: LOCAL-->Total: 301843.875MB-->Free: 30945.25MB-->Used: 270898.625MB-->PFree: 10%--> <br />Tablespace: TEST_DATA-->Status: OLN-->Ext_MGR: LOCAL-->Total: 7960MB-->Free: 422.5MB-->Used: 7537.5MB-->PFree: 5%--> <br />Tablespace: ADVER_INDEX-->Status: OLN-->Ext_MGR: LOCAL-->Total: 550MB-->Free: 55.25MB-->Used: 494.75MB-->PFree: 10%--> <br />Tablespace: showtsps：Tablespace: ACCSTAT_INDEX-->Status: OLN-->Ext_MGR: LOCAL-->Total: 301843.875MB-->Free: 30945.25MB-->Used: 270898.625MB-->PFree: 10%-->
我们来看看改进后的效果，这样可能就更清晰一些了，当然这个只是个改进的方向而已。
| Tablespace: TEST_INDEX | Status: OLN | Ext_MGR: LOCAL | Total: 301843MB | Free: 30937MB | Used: 270906MB | PFree: 10% |
| Tablespace: TEST_DATA | Status: OLN | Ext_MGR: LOCAL | Total: 7960MB | Free: 422MB | Used: 7537MB | PFree: 5% |
| Tablespace: TEST_INDEX | Status: OLN | Ext_MGR: LOCAL | Total: 550MB | Free: 55MB | Used: 494MB | PFree: 10% |
| Tablespace: TEST_DATA2 | Status: OLN | Ext_MGR: LOCAL | Total: 45167MB | Free: 2302MB | Used: 42865MB | PFree: 5% |
| Tablespace: TEST_INDEX2 | Status: OLN | Ext_MGR: LOCAL | Total: 13990MB | Free: 688MB | Used: 13301MB | PFree: 5% |
对于这种情况，大多数情况下就是监控指标能够实现，但是展现出来的效果不明显，这样很可能就会使得这个功能没有什么实用价值。
尽管sqlplus本身提供了 markup html on的选项，但是在orabbix中还是使用受限，所以只能另辟蹊径。
检查表空间的脚本如下，只是一个参考例子。
select
d.tablespace_name,
decode(d.status,
'ONLINE', 'OLN',
'READ ONLY', 'R/O',
d.status) status,
d.extent_management,
decode(d.allocation_type,
'USER','',
d.allocation_type) allocation_type,
(case
when initial_extent < 1048576
then lpad(round(initial_extent/1024,0),3)||'K'
else lpad(round(initial_extent/1024/1024,0),3)||'M'
end) Ext_Size,
NVL (a.bytes / 1024 / 1024, 0) MB,
NVL (f.bytes / 1024 / 1024, 0) free,
(NVL (a.bytes / 1024 / 1024, 0) - NVL (f.bytes / 1024 / 1024, 0)) used,
NVL (l.large / 1024 / 1024, 0) largest,
d.MAX_EXTENTS ,
lpad(round((f.bytes/a.bytes)*100,0),3) pfree,
(case when round(f.bytes/a.bytes*100,0) >= 20 then ' ' else '*' end) alrt
FROM sys.dba_tablespaces d,
(SELECT tablespace_name, SUM(bytes) bytes
FROM dba_data_files
GROUP BY tablespace_name) a,
(SELECT tablespace_name, SUM(bytes) bytes
FROM dba_free_space
GROUP BY tablespace_name) f,
(SELECT tablespace_name, MAX(bytes) large
FROM dba_free_space
GROUP BY tablespace_name) l
WHERE d.tablespace_name = a.tablespace_name(+)
AND d.tablespace_name = f.tablespace_name(+)
AND d.tablespace_name = l.tablespace_name(+)
AND NOT (d.extent_management LIKE 'LOCAL' AND d.contents LIKE 'TEMPORARY')
UNION ALL
select
d.tablespace_name,
decode(d.status,
'ONLINE', 'OLN',
'READ ONLY', 'R/O',
d.status) status,
d.extent_management,
decode(d.allocation_type,
'UNIFORM','U',
'SYSTEM','A',
'USER','',
d.allocation_type) allocation_type,
(case
when initial_extent < 1048576
then lpad(round(initial_extent/1024,0),3)||'K'
else lpad(round(initial_extent/1024/1024,0),3)||'M'
end) Ext_Size,
NVL (a.bytes / 1024 / 1024, 0) MB,
(NVL (a.bytes / 1024 / 1024, 0) - NVL (t.bytes / 1024 / 1024, 0)) free,
NVL (t.bytes / 1024 / 1024, 0) used,
NVL (l.large / 1024 / 1024, 0) largest,
d.MAX_EXTENTS ,
lpad(round(nvl(((a.bytes-t.bytes)/NVL(a.bytes,0))*100,100),0),3) pfree,
(case when nvl(round(((a.bytes-t.bytes)/NVL(a.bytes,0))*100,0),100) >= 20 then ' ' else '*' end) alrt
FROM sys.dba_tablespaces d,
(SELECT tablespace_name, SUM(bytes) bytes
FROM dba_temp_files
GROUP BY tablespace_name order by tablespace_name) a,
(SELECT tablespace_name, SUM(bytes_used ) bytes
FROM v\$temp_extent_pool
GROUP BY tablespace_name) t,
(SELECT tablespace_name, MAX(bytes_cached) large
FROM v\$temp_extent_pool
GROUP BY tablespace_name order by tablespace_name) l
WHERE d.tablespace_name = a.tablespace_name(+)
AND d.tablespace_name = t.tablespace_name(+)
AND d.tablespace_name = l.tablespace_name(+)
AND d.extent_management LIKE 'LOCAL'
AND d.contents LIKE 'TEMPORARY'
ORDER by 1
可以看到脚本还是相对比较复杂的，这么复杂的功能都能实现，但是展现的效果却打了折扣，导致了功能上的丰富和显示效果不太相符。
这个时候还是得考虑嵌入点html代码，自己也着实温习了一下以前html的东西。
在经过了大量的测试之后，总算做出了一些改进。
最终需要sql查出来的结果需要时下面的格式：
<table border='1' width='90%' align='center' ><tr><td width="40%">Tablespace: TEST_TABLE
SPACE_DATA</td>
<td width="10%">Status: OLN</td> <td width="10%">Ext_MGR: LOCAL</td>
<td width="10%">Total: 29031.875MB</td>
<td width="10%">Free: 5.3125MB</td>
<td width="10%">Used: 29026.5625MB</td>
<td width="10%">PFree: 0%</td></tr></table>
<table border='1' width='90%' align='center' ><tr><td width="40%">Tablespace: TEST_TABLE2
SPACE_INDEX</td>
<td width="10%">Status: OLN</td> <td width="10%">Ext_MGR: LOCAL</td>
<td width="10%">Total: 12876.8125MB</td>
<td width="10%">Free: 10.6875MB</td>
<td width="10%">Used: 12866.125MB</td>
<td width="10%">PFree: 0%</td></tr></table>
实现的sql的代码如下,这个时候已经不是单纯的脚本了，我叫它代码了。：）
select
'<table border='||chr(34)||'1'||chr(34)||' width='||chr(34)||'90%'||chr(34)||' align='||chr(34)||'center'||chr(34)||'<tr>'||
'<td width='||chr(34)||'40%'||chr(34)||'>Tablespace: '||d.tablespace_name||'</td>',
'<td width='||chr(34)||'10%'||chr(34)||'>Status: '||decode(d.status,
'ONLINE', 'OLN',
'READ ONLY', 'R/O',
d.status)||'</td>' status,
'<td width='||chr(34)||'10%'||chr(34)||'>Ext_MGR: '||d.extent_management||'</td>',
'<td width='||chr(34)||'10%'||chr(34)||'>Total: '||trunc(NVL (a.bytes / 1024 / 1024, 0))||'MB</td>' MB,
'<td width='||chr(34)||'10%'||chr(34)||'>Free: '||trunc(NVL (f.bytes / 1024 / 1024, 0))||'MB</td>' free,
'<td width='||chr(34)||'10%'||chr(34)||'>Used: '||trunc((NVL (a.bytes / 1024 / 1024, 0) - NVL (f.bytes / 1024 / 1024, 0)))||'MB</td>' used,
'<td width='||chr(34)||'10%'||chr(34)||'>PFree: '||lpad(round((f.bytes/a.bytes)*100,0),3)||'%</td></tr></table>' pfree
FROM sys.dba_tablespaces d,
(SELECT tablespace_name, SUM(bytes) bytes
FROM dba_data_files
GROUP BY tablespace_name) a,
(SELECT tablespace_name, SUM(bytes) bytes
FROM dba_free_space
GROUP BY tablespace_name) f,
(SELECT tablespace_name, MAX(bytes) large
FROM dba_free_space
GROUP BY tablespace_name) l
WHERE d.tablespace_name = a.tablespace_name(+)
AND d.tablespace_name = f.tablespace_name(+)
AND d.tablespace_name = l.tablespace_name(+)
AND NOT (d.extent_management LIKE 'LOCAL' AND d.contents LIKE 'TEMPORARY')
AND lpad(round((f.bytes/a.bytes)*100,0),3)<=10
UNION ALL
select
'<table border='||chr(34)||'1'||chr(34)||' width='||chr(34)||'90%'||chr(34)||' align='||chr(34)||'center'||chr(34)||'<tr>'||
'<td width='||chr(34)||'40%'||chr(34)||'>Tablespace:'||d.tablespace_name||'</td>',
'<td>Status: '||decode(d.status,
'ONLINE', 'OLN',
'READ ONLY', 'R/O',
d.status)||'</td>' status,
'<td width='||chr(34)||'10%'||chr(34)||'>Ext_MGR: '||d.extent_management||'</td>',
'<td width='||chr(34)||'10%'||chr(34)||'>Total: '||trunc(NVL (a.bytes / 1024 / 1024, 0))||'MB</td>' MB,
'<td width='||chr(34)||'10%'||chr(34)||'>Free: '||trunc((NVL (a.bytes / 1024 / 1024, 0) - NVL (t.bytes / 1024 / 1024, 0)))||'MB</td>' free,
'<td width='||chr(34)||'10%'||chr(34)||'>Used: '||trunc(NVL (t.bytes / 1024 / 1024, 0))||'MB</td>' used,
'<td width='||chr(34)||'10%'||chr(34)||'>PFree: '||lpad(round(nvl(((a.bytes-t.bytes)/NVL(a.bytes,0))*100,100),0),3)||'%</td></tr></table>' pfree
FROM sys.dba_tablespaces d,
(SELECT tablespace_name, SUM(bytes) bytes
FROM dba_temp_files
GROUP BY tablespace_name order by tablespace_name) a,
(SELECT tablespace_name, SUM(bytes_used ) bytes
FROM v$temp_extent_pool
GROUP BY tablespace_name) t,
(SELECT tablespace_name, MAX(bytes_cached) large
FROM v$temp_extent_pool
GROUP BY tablespace_name order by tablespace_name) l
WHERE d.tablespace_name = a.tablespace_name(+)
AND d.tablespace_name = t.tablespace_name(+)
AND d.tablespace_name = l.tablespace_name(+)
AND d.extent_management LIKE 'LOCAL'
AND d.contents LIKE 'TEMPORARY'
AND lpad(round(nvl(((a.bytes-t.bytes)/NVL(a.bytes,0))*100,100),0),3) <= 10
ORDER by 1;
可以在适当的时候来尝试使用一下，效果虽然还是丑了些，不过已经做过格式化了。
改进的方向其实还是很多。比如嵌入颜色，格式布局等等都是需要改进的方向。
来自 “ ITPUB博客 ” ，链接：http://blog.itpub.net/23718752/viewspace-1777927/，如需转载，请注明出处，否则将追究法律责任。