ORA-12519: TNS:no appropriate service ha

ORA-12519, TNS:no appropriate service handler found 
The Connection descriptor used by the client was: 
192.168.1.200:1521:orcl 
问题解决： 
select count(*) from v$process --当前的连接数 
select value from v$parameter where name = 'processes' --数据库允许的最大连接数 
 
修改最大连接数: 
alter system set processes = 300 scope = spfile; 
 
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;
 
作者“ERDP技术架构”