Io exception: Connection refused(DESCRIPTION=(TMP=)(VSNNUM=153092352)(ERR=12519)(ERROR_STACK=(ER

ORA-12519拒绝错误，发现是数据的连接池达到的极致。

 

参考文档：

http://www.cnblogs.com/dba_xiaoqi/archive/2010/11/01/1866459.html

http://blog.sina.com.cn/s/blog_9426b1bd01012qsr.html

http://blog.itpub.net/7425608/viewspace-998435/

http://blog.csdn.net/qachenzude/article/details/7276225

 

select count(*) from v$process;

select count(*) from v$session;

select * from v$instance;

select INSTANCE_NAME from v$instance;

select * from v$license;

select * from v$parameter;

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

select * from v$parameter where name = 'sessions';