上一次数据库报ora-04301，调整了一下shared pool size ，好过一段时间，最近又发生了这个错误。所以决心好好整一下应用，主要还是碎片太严重啊。
| 代码如下 |
复制代码 |
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select ksmchidx,
(case
when ksmchsiz >= 65560 then
254
when ksmchsiz >= 32792 then
253
when ksmchsiz >= 40 then
1
when ksmchsiz >= 32 then
0
end) bucket#,
count(*) free_chunks,
sum(ksmchsiz) free_space,
trunc(avg(ksmchsiz)) avg_chunk_size
from x$ksmsp
where ksmchcls = 'free'
group by ksmchidx,
(case
when ksmchsiz >= 65560 then
254
when ksmchsiz >= 32792 then
253
when ksmchsiz >= 40 then
1
when ksmchsiz >= 32 then
0
end);
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这个是观察shared pool碎片情况的SQL。
| 代码如下 |
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select name,value from v$sysstat where name like '%parse%';
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查看解析情况，好多的硬解析，和软解析差不了！
| 代码如下 |
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SELECT substr(sql_text, 1, 40) "SQL", count(*), sum(executions) "TotExecs",max(sql_id) sql_id
FROM v$sqlarea
WHERE executions < 5
GROUP BY substr(sql_text, 1, 40)
HAVING count(*) > 30
ORDER BY 2;
select * FROM v$sqlarea where sql_id='g2b789ppwxjx8';
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查占用shared pool较多的sql。
| 代码如下 |
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ELECT KSMCHCLS CLASS, COUNT(KSMCHCLS) NUM, SUM(KSMCHSIZ) SIZ,
To_char( ((SUM(KSMCHSIZ)/COUNT(KSMCHCLS)/1024)),'999,999.00')||'k' "AVG SIZE"
FROM X$KSMSP GROUP BY KSMCHCLS;
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shared pool 情况。
