Oracle回滚段使用查询代码详解

select s.sid,
   r.name rr,
    nvl(s.username,'no transaction') us,
    s.osuser os,
    s.terminal te,
    t.used_urec rec,
    t.used_ublk blk
 from v$lock l, v$session s, v$rollname r,v$transaction t
 where l.sid = s.sid(+) and
    trunc(l.id1/65536) = r.usn and
    l.type = 'TX' and
    t.ses_addr = s.saddr and
    l.lmode = 6;