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POHow can I determine down time from logs in database table
 

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  1. POHow can I determine down time from logs in database table
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    <p>I have a database table which holds error logs reported from an application.</p> <p>If certain errors occur, the application requires human intervention before becoming active again.</p> <p>I need to sort through the logs and determine the total amount of time that has accrued between every pair of events. </p> <p>So when the app goes into ERROR state where intervention is required at a certain time, I need to find the elapsed time to the next error log where the app was restarted.</p> <p>Then I need to the sum of the total elapsed time between every pair of events.</p> <p>The table looks like this:</p> <pre><code>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 </code></pre> <p>So basically I need to find the difference between the timestamps of every ERROR and the subsequent App Restarted log message.</p> <p>Then get the sum of all of these durations</p> <p>Can anyone point me in the right direction?</p>
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    1. COI asked a similar question, not too long ago. You can see that http://stackoverflow.com/questions/18409254/get-time-difference-between-group-of-records
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    2. COWhat if there are two errors (e.g. one at ErrorID = 23, and one at ErrorID = 24)?
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      1. USAaron Bertrand
 

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