ORA-12721: operation cannot execute when other sessions are active

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;