Oracle中cannot drop a user that is currently connected

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cannot drop a user that is currently connected SQL〉DROP USER USER1 CASCADE ERROR：ORA-01940: cannot drop a user that is currently connected 由于当前用户正连接到数据库，所以无法删除 解决办法： 1、查询此用户的会话进程， SQL〉SELECT SID,SERIAL# FROM V$SESSION WHERE USERNAME='USER1';          SID    SERIAL# ---------- ----------         24      25341         86      18117   2、结束此用户的所有会话 SQL>ALTER SYSTEM KILL SESSION '24,25341'; System altered. SQL>ALTER SYSTEM KILL SESSION '86,18117'; System altered.   3、删除用户 SQL〉DROP USER USER1 CASCADE；