Listener refused the connection with the following error: ORA-12519, TNS:no appr

异常：

Listener refused the connection with the following error: ORA-12519, TNS:no appropriate service handler found The Connection descriptor used by the client was: localhost:1521:orcl Hibernate operation: Cannot open connection; uncategorized SQLException for SQL [???]; SQL state [null]; error code [0]; Listener refused the connection with the following error: ORA-12519, TNS:no appropriate service handler found The Connection descriptor used by the client was: localhost:1521:orcl ; nested exception is 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: localhost:1521:orcl

[quote]查询数据库当前进程的连接数：

　select count(*) from v$process;

　　查看数据库当前会话的连接数：

　　elect count(*) from v$session;

　　查看数据库的并发连接数：

　　select count(*) from v$session where status='ACTIVE';

　　查看当前数据库建立的会话情况：

　　select sid,serial#,username,program,machine,status from v$session;

　　查询数据库允许的最大连接数：

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

　　或者：show parameter processes;

　　修改数据库允许的最大连接数：

　　alter system set processes = 300 scope = spfile;

　　(需要重启数据库才能实现连接数的修改)

　　重启数据库：

　　shutdown immediate;

　　startup;

　　查看当前有哪些用户正在使用数据：

　　select osuser,a.username,cpu_time/executions/1000000's' ,sql_fulltext,machine

　　from v$session a,v$sqlarea b

　　where a.sql_address = b.address

　　order by cpu_time/executions desc;

　　备注：UNIX 1个用户session对应一个操作系统process，而Windows体现在线程。

　　启动oracle

　　su - oracle

　　sqlplus system/pwd as sysdba //进入sql

　　startup //启动数据库

　　lsnrctl start //启动监听

　　sqlplus "/as sysdba"

　　shutdown immediate;

　　startup mount;

　　alter database open;

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: 127.0.0.1:1521:ORCL

这种错误，网上查了很多，都说是ip地址改变之后的问题，要把tnsnames.ora中的实例配置中改为计算机名，我试过之后问题还是不能解决，今天终于找到问题所在了，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;[/quote]

就可以了，当然300可以根据实际情况设置。

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Listener refused the connection with the following error: ORA-12519, TNS:no appr

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