oracle中ora-04301故障处理

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

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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);

这个是观察shared pool碎片情况的SQL。

代码如下	复制代码
select name,value from v$sysstat where name like '%parse%';

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';

查占用shared pool较多的sql。

代码如下	复制代码
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;

shared pool 情况。

补充：数据库,Oracle教程