根据sid找出pid并杀死

根据SID找SPID

select pro.spid from v$session ses,v$process pro where ses.sid=xxx and ses.paddr=pro.addr;

根据SPID找SID,SERIAL

select s.sid,s.serial# from v$session s,v$process p where s.paddr=p.addr and p.spid='xxx'