Listener refused the connection with the following error 错误解决

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web应用连接oracle数据库时,经常在查询数据时发生

Listener refused the connection with the following error: ORA-12519, TNS:no appropriate service handler found The Connection descriptor used by the client was: ip地址:1521:数据库名

这是数据库连接数量的问题,12519错误为监听不能提供服务,通常为数据库进程达到上限导致。

可以先执行下 select count(*) from v$process ,看下现在系统有多少连接数,然后再查询 select value from v$parameter where name = ‘processes‘ ,看下oracle设置中设置了多少连接数,一般一个应用都会使用20个,所以如果你开了几个应用的话(web、pl/sql、……)就会出这个问题了,这时只需要执行下

alter system set processes = 300 scope = spfile;------这一步是关键

就可以了,当然300可以根据实际情况设置。
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原文链接:https://blog.csdn.net/han_ying_ying/java/article/details/42026595

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