Querying SSRS Execution Log

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Querying SSRS Execution Log

Neil Burton

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Points: 22999
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March 13, 2020 at 10:48 am

#3733982
I've come across an odd situation when querying the ExecutionLog3 view in the SSRS database. The TOP 1000 rows query below essentially times out because as soon as I see the user hasn't run something I stop it. This takes a couple of seconds but the query keeps running for considerably longer and completes in four minutes or so.
```
SELECT TOP (1000)  [InstanceName]
      ,[ItemPath]
      ,[UserName]
      ,[ExecutionId]
      ,[RequestType]
      ,[Format]
      ,[Parameters]
      ,[ItemAction]
      ,[TimeStart]
      ,[TimeEnd]
      ,[TimeDataRetrieval]
      ,[TimeProcessing]
      ,[TimeRendering]
      ,[Source]
      ,[Status]
      ,[ByteCount]
      ,[RowCount]
  FROM [dbo].[ExecutionLog3]
  WHERE 
ItemPath LIKE '/Test%'
ORDER BY
TimeStart DESC;
```
When I run the query below, it takes 56 seconds for the results to come back but the query has completed at that point.
```
SELECT TOP (100) PERCENT [InstanceName]
      ,[ItemPath]
      ,[UserName]
      ,[ExecutionId]
      ,[RequestType]
      ,[Format]
      ,[Parameters]
      ,[ItemAction]
      ,[TimeStart]
      ,[TimeEnd]
      ,[TimeDataRetrieval]
      ,[TimeProcessing]
      ,[TimeRendering]
      ,[Source]
      ,[Status]
      ,[ByteCount]
      ,[RowCount]
  FROM [dbo].[ExecutionLog3]
  WHERE 
ItemPath LIKE '/Test%'
ORDER BY
TimeStart DESC;
```
I've had a look at the execution plans and the principal difference I can see is that the TOP (100) PERCENT plan goes parallel. I'm not sure why this would be though. Can anybody shed any light on this?
On two occasions I have been asked, "Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?" ... I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question.
—Charles Babbage, Passages from the Life of a Philosopher
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Site Owners SSC Guru Points: 80330 More actions · Answer 1

Thanks for posting your issue and hopefully someone will answer soon.

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