No resources currently available in pool mcmRACDataSource to allocate to applications, please increa

原因：weblogic服务器节点超载

日志：No resources currently available in pool xxxx to allocate to applications, please increase the size of the pool and retry…

检查：测试weblogi 数据源-检测

（异常忘记截图了）

发现：当前活动数=最大活动。节点状态为超载。

解决：

• 检查数据库连接数

select value from v$parameter where name = 'processes'

• 查看当前会话数量

 select * from v$session 

• 查询当前用户下会话激活的会话

select * from v$session  where username='TAMESSAGE' and status='ACTIVE'

发现大量会话非激活

查询非激活会话

select count (*),v.PREV_SQL_ADDR,v.PREV_HASH_VALUE
from v$session v where username='TAMESSAGE' group by v.PREV_SQL_ADDR,v.PREV_HASH_VALUE
  order by count (*) desc ;

查询count比较大的会话内容

  
  select * from v$sql s where s.ADDRESS= '0000000A5759D3C0' and s.HASH_VALUE= '3453647517' ;

处理：这里可以看到会话所执行的sql语句。然后拉出来单独跑下发现异常耗时。优化即可。