I have a package with a OnPreExecute event handler which checks the record counts in the source database. (it's a little more complex than this)
If for some reason one of these tasks on the event handler fails - I would of expected the OnError Event Handler to fire, but it doesn't - is there anyway to get it to fire to log the reason for the OnPreExecute event failure?
(also - if there is more advanced reading on event handlers, they'd be great - all I can find is the basic Microsoft references)
Related
I have created a SSIS package for migrating data from one sql server database to another. The tasks are created in a sequence container.
I have created events in the event handler and added the send mail task for sending email and getting the following error. I get this error even when I try to evaluate the expression in the expression builder. Please note that I am getting the error on the onTaskFailed event handler. I think the system error variables are not accessible in that event. Do I really need that event handler
I can see the variable in the collection. Not sure of how the scope affects it.
This is definitely a scoping issue. The system variable 'ErrorDescription' is only avialable at 'OnError' event handler and can't be used in 'TaskFailed' event handler. As to the question of if you need it or not, that is something your business logic should dictate. I would suggest to move your code to 'OnError' event handler.
I have a package with a Data Flow task containing Excel Source. DelayValidation is set to True for the Data Flow.
There is an event handler OnTaskFailed at package level. However if the Excel Source validaton fails the OnTaskFailed handler does not execute. It seems the validation error does not fire Task Failed event.
Is it possible to configure it to fire the Task Failed event?
I think in your case, instead of setting up at the package level, you should set it at the data flow task level. What I mean is, in the event handler pane you can change the executable to the certain data flow task.
How do I know which event to listen to?
For example gulp.dest fires the finish event and then somewhat later the end event. Some other streams only fire the finish event. When I have a method that returns a stream (could be a read or write stream) and I execute the method, how can I wait for the returned stream to be finished? When do I have to register for the finish and when for the end event?
The gulp.dest object is a Transform object - it handles reading from the (piped) source and writing to the destination. The 'end' event is emitted by the reader, while the 'finish' event is emitted by the writer.
If you are interested in ensuring the reading completes correctly, use .on('end'). See: https://nodejs.org/api/stream.html#stream_event_end.
Readable streams will emit this once data has been completely consumed by the stream. So there may be cases when it doesn't fire, due to the internal logic of the transformation or to an error condition.
If it is the completion of the writing you are interested in, then use .on('finish') instead. See: https://nodejs.org/api/stream.html#stream_event_finish.
Writable streams will emit this after data has been flushed to the underlying system. So in cases where expected read errors are handled, or where the transformation ends the reading early, this event should still be fired. As I understand it, this won't fire if the writing fails unexpectedly.
I have OnPostExecute event handlers on all my control flow elements, but as soon as I put a OnError handler on the package level, I dont see the task level handlers anymore.
Is this a known bug or is it something that I am doing wrong.
This is because the OnPostExecute event handler is created at each package task. The package level indicates an OnPosteExecute event on all tasks.
What do you mean you don't see them? Do you mean that the only thing listed under Event handler in bold is the OnError for the package?
If so, fear not, all of your package OnPostExecute events still exist. The trick is the focus of your cursor when you clicked Event Handlers was on the Package. To see event handler's associated to a given Executable, either click back to the Control flow, click your given executable and then click Event Handler. The easier way is to just use the Executable selector bar and drill into it.
I had defined an OnPostExecute event on my Execute SQL Task so I clicked that and selected OK.
Now I can see the event for that Executable
If you don't want to spend your life clicking through various executables trying to find something, the Package Explorer tab is amazingly helpful in this regard and one that I find people don't use.
Here you can quickly see I defined 2 event handlers on my Execute SQL Task, one for OnPostExecute and one of OnError, in addition to the OnError event I have defined at the package level.
Finally, a quick note about order of operations. Given my scenario of OnError event handlers defined on the control flow elements and the Package level and an OnPostExecute event on the control flow elements, when my Execute SQL Task raises the error (divide by zero), I will see
"Execute SQL Task"'s OnError event fires
"so_EventHandlerRajiv"'s (package) OnError event fires
"Execute SQL Task"'s OnPostExecute event fires
So, OnError will fire before OnPostExecute and one a given Event Handler begins firing, it will percolate up to all the listening handlers.
Maybe you can use the package explorer to see all the defined event handler instead clicking on the properties of each control flow task.
mario
http://msdn.microsoft.com/en-us/library/ms190114.aspx
I need to log the Severity of Error in OnErrorCode event handler in SSIS.
Severity can be like : Info, Warning, Critical
I am just curious if anybody knows about how to get this information to log in EventHandler in SSIS and provide any URL which can be useful in looking for this ?
Just to clarify, are you referring to something that is internal to SSIS, or is this some bespoke classification?
In SSIS, there is an OnInformation event and OnWarning event in the same manner that there is an OnError event. Maybe you could consider logging out from these events as well as the OnError event.
As far as I can tell, only OnError will fail your package, unless there is something I am missing.