連接oracle11g報錯：ORA-12516 TNS:listener could not find available handler with matching protocol stack

客戶端連接oracle11g報錯：ORA-12516 TNS:listener could not find available handler with matching protocol stack

解決方法：

1.先查詢連接限制數

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

2.查詢已經連接

select count(*) from v$process;

3.修改連接數

alter system set processes=500 scope=spfile;

alter system set sessions=555 scope=spfile;

4.重啓oralce

注意：上述語句可直接通過安裝oracle服務器進入命令：

以sysdba身份登陸PL/SQL
sqlplus / as sysdba;