1. 用sys登录sql plus: usename: sys as sysdba password: ****
2. 查看最大连接数: select value from V$parameter where name=”processes”;
3. 查看当前连接数: select count (*) from V$process;
4. 把最大连接数改成300:alter system set processes=300 scope=spfile
5. 重启DB: shutdown immediate; startup;