查看长时间运行的查询 / 会话

命令

-- Active, long-running SQL:
SELECT s.sid, s.serial#, s.username, s.status,
       s.last_call_et AS seconds_active,
       s.sql_id, q.sql_text,
       s.event, s.machine, s.program
FROM   v$session s
  LEFT JOIN v$sql q ON q.sql_id = s.sql_id
                   AND q.child_number = s.sql_child_number
WHERE  s.type = 'USER'
  AND  s.status = 'ACTIVE'
  AND  s.last_call_et > 60
ORDER BY s.last_call_et DESC;

-- Long operations with percentage progress:
SELECT sid, serial#, opname, sofar, totalwork,
       ROUND(sofar/NULLIF(totalwork,0)*100,1) AS pct, time_remaining
FROM   v$session_longops
WHERE  sofar < totalwork ORDER BY start_time DESC;

作用

列出运行超过 60 秒的活动会话以及长时间运行的批处理操作的进度。

适用场景

在收到响应慢的投诉时，找出是哪个查询让系统保持繁忙。

注意

last_call_et 是自上次调用以来的时间；空闲会话的该值也可能很大，因此 status='ACTIVE' 过滤条件很重要。仅查询；无风险。