在run load test的时候，web server后台日志中出现了不少如下的错误信息...
Caused by: java.sql.SQLException: Listener refused the connection with the following error:
ORA-12519, TNS:no appropriate service handler found
The Connection descriptor used by the client was:
10.80.15.19:1521:orcl
查看了下数据库后台的一些trace 文件和alert文件发现如下信息...
-- alert file...
Wed Oct 12 18:08:28 2011
ORA-00020: No more process state objects available
ORA-20 errors will not be written to the alert log for
the next minute. Please look at trace files to see all
the ORA-20 errors.
-- trace file...
*** 2011-10-12 18:06:20.255
ORA-00020: maximum number of processes 500 exceeded
很显然是因为参数processes的值太小了的原因，因为load test触发了太多的session，所以需要调大这个参数.
网上有篇文章也提到这个问题...
