Question

我有一个数据库表，其中包含从应用程序报告的错误日志。

如果发生某些错误，应用程序需要人工干预才能再次激活。

我需要对日志进行排序并确定每对事件之间累积的总时间。

因此，当应用程序进入ERROR状态，在某个时间需要干预时，我需要找到重新启动应用程序的下一个错误日志所用的时间。

然后我需要总计每对事件之间的总耗用时间。

表格如下：

ErrorID |  ErrorMessage | ErrorDateTime
---------------------------------------------
 20     | ex. msg 1     | 2013-09-01 00:10:10 
 21     | ex. msg 2     | 2013-09-01 00:10:15   
 22     | ex. msg 3     | 2013-09-01 00:10:20 
 23     | ERROR         | 2013-09-01 00:10:25
 24     | ex. msg 4     | 2013-09-01 00:10:30 
 25     | ex. msg 5     | 2013-09-01 00:10:35       
 26     | ex. msg 6     | 2013-09-01 00:10:37   
 27     | App Restarted | 2013-09-01 00:11:30 
 28     | ex. msg 7     | 2013-09-01 00:11:35 
 29     | ex. msg 8     | 2013-09-01 00:11:40   
 30     | ex. msg 9     | 2013-09-01 00:11:43 
 31     | ERROR         | 2013-09-01 00:11:45
 32     | ex. msg 10    | 2013-09-01 00:12:10 
 33     | ex. msg 11    | 2013-09-01 00:12:20       
 34     | ex. msg 12     | 2013-09-01 00:12:22   
 35     | App Restarted | 2013-09-01 00:13:30

所以基本上我需要找到每个ERROR的时间戳和随后的App Restarted日志消息之间的区别。

然后得到所有这些持续时间的总和

有人能指出我正确的方向吗？

Answer 1

;WITH x AS
(
  SELECT ErrorID, ErrorMessage, ErrorDateTime,
    rn = ROW_NUMBER() OVER (ORDER BY ErrorDateTime, ErrorID)
  FROM dbo.YourLogTable
  WHERE ErrorMessage IN ('ERROR', 'App Restarted')
)
SELECT
  y.ErrorID, 
  x.ErrorID, 
  [Back_Up] = y.ErrorDateTime, 
  SecondsDown = DATEDIFF(SECOND, y.ErrorDateTime, x.ErrorDateTime)
FROM x
LEFT OUTER JOIN x AS y
ON x.rn = y.rn + 1
WHERE x.ErrorMessage = 'App Restarted';

这可以为您提供每个停机时间。我不确定SUM在应用的整个生命周期中有什么价值？限于一定的时间范围？别的什么？但你可以这样做：

;WITH x AS
(
  SELECT ErrorID, ErrorMessage, ErrorDateTime,
    rn = ROW_NUMBER() OVER (ORDER BY ErrorDateTime)
  FROM dbo.YourLogTable
  WHERE ErrorMessage IN ('ERROR', 'App Restarted')
)
SELECT
   TotalDowntime = SUM(DATEDIFF(SECOND, y.ErrorDateTime, x.ErrorDateTime))
FROM x
LEFT OUTER JOIN x AS y
ON x.rn = y.rn + 1
WHERE x.ErrorMessage = 'App Restarted';

Answer 2

以下查询获取每个错误的重启时间：

select l.*,
       (select top 1 ErrorDateTime
        from logs l2
        where l2.ErrorId > l.ErrorId and
              l2.ErrorMessage = 'App Restarted'
        order by l2.ErrorId
       ) as RestartTime
from logs l
where l.ErrorMessage = 'ERROR';

获得总和需要求和时间。这是以秒为单位的总和：

with errors as (
    select l.*,
           (select top 1 ErrorDateTime
            from logs l2
            where l2.ErrorId > l.ErrorId and
                  l2.ErrorMessage = 'App Restarted'
            order by l2.ErrorId
           ) as RestartTime
    from logs l
    where l.ErrorMessage = 'ERROR'
   )
select sum(datediff(second, ErrorDateTime, RestartTime)) as SecondsDown
from errors;

Answer 3

您也可以尝试这种方式......

;WITH x AS
(
  SELECT ErrorID, ErrorMessage, ErrorDateTime,
    rn = ROW_NUMBER() OVER (ORDER BY ErrorDateTime)
  FROM dbo.YourLogTable
  WHERE ErrorMessage IN ('ERROR', 'App Restarted')
)
SELECT
   TotalDowntime = SUM(DATEDIFF(SECOND, y.ErrorDateTime, x.ErrorDateTime))
FROM x
LEFT OUTER JOIN x AS y
ON x.rn = y.rn + 1
WHERE x.ErrorMessage = 'App Restarted';

如何从数据库表中的日志中确定停机时间

3 个答案: