1. 用sys登入sql plus:

    usename: sys as sysdba

    password: ****

2. 檢視最大連線數： select value from V$parameter where name="processes";

3. 檢視當前連線數： select count (*) from V$process;

4. 把最大連線數改成300：alter system set processes=300 scope=spfile

5. 重啟DB: shutdown abort


              startup;