文档解释
ORA-12721: operation cannot execute when other sessions are active
Cause: This command can only be run when there are no other sessions active
Action: Ensure there are no other connections to the database
ORA-12721错误表明当使用异步I/O系统调用时,执行此操作时存在其他会话。
官方解释
常见案例
正常处理方法及步骤
SELECT s.sid, s.serial#, s.username
FROM v$session s, v$process p
WHERE s.paddr = p.addr
ORDER BY s.sid;