ORA-12519: TNS:no appropriate service handler found 解决

有时候连得上数据库,有时候又连不上.

可能是数据库上当前的连接数目已经超过了它能够处理的最大值.

 

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 bwhere a.sql_address =b.address order by cpu_time/executions desc;