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SAM - SQL User Experience Monitor to show when nodes are deleted

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Hi All,

 

I am looking at a way of tracking deletions to the dbo.nodes table and have tried this by using a SQL User Experience Monitor and set the critical statistic threshold to any value less than 0, but the difference is not returning a negative integer value when a node is deleted.

Here is a screen shot of my application monitor:

 

SAM SQL UX Mon.PNG

 

The SQL query "SELECT COUNT (*) FROM dbo.Nodes" returns an integer value. I have copied the UX Monitor and configured this not to count the statistic as a difference to confirm that the value returned increase or decreases.

I poll, note the value e.g. 23 and difference = 0 then add a node and poll (values return 24 & 1). I poll again and the values return are 24 & 0 - no difference between 2 polls as expected.

 

I remove the node, poll again and the values return 23 & 0. This I would expect to return as -1 and then trigger the critical threshold but it doesn't.

 

Has anyone else tried to achieve this and if they have, is there a better way of doing this?

 

Many thanks

Garreth


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