当我们登录数据库时候，提示当前用户已登录，而我们有不知道谁在登录，而我们又要登
录，我们可以迁出这个用户以利我们登录
步骤：
1. su - oralce
input passpd
2. sqlplus / as sysdba
3. desc $vsession
4. select username,SID,SERIAL# from v$session;
5. alter system kill session '152,21669';
note: make sure the user you want to kill sid=152; serial#=21669.
6. system return: System altered.
7. The user has been killed, so you can login to oracle
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