SSIS Transactions And Checkpoints

May 26, 2007

Hello everyone, I had been studying the relationship between SSIS Checkpoints and SSIS Transactions.



What I want to do is to create a package with different task, where each one task creates a new transaction, and the same time each task be a checkpoint, it€™s in order to restarts the package from the failure task not from the beginning.



The Transaction-Checkpoint solution contains two packages*:
CkeckpointsAndTransactions1.dtsx and CkeckpointsAndTransactions2.dtsx



Package CkeckpointsAndTransactions1 contains four tasks, task three always fail. The package is configured to use checkpoints and each individual task creates a checkpoint. Additionally, each task creates a new transaction. The package has the TransactionOption setting to NoSupported.



In the CkeckpointsAndTransactions1 package there is something wrong, when the third task fails and I restart the package, the package starts from the beginning, this is wrong!!, the package should restart from the failure task.



In order to the package works like is expected it€™s necessary to add a new task between second and third task. It is also necessary that this new task hasn€™t transaction support. This is shown in the CkeckpointsAndTransactions2 package, in this package after package failure, I restart the package and the package restarts from the failure task, like is expected, but the additional task should not be necessary!!



Does anyone what is wrong in my packages?? How can I to create a package with different task, where each task creates a new transaction, and the same time each task be a checkpoint?



*Please download the BIDS solution from hernan93.files-upload.com (Transaction-Checkpoint.zip file)

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Transactions && Checkpoints; Bug Or Feature?

Aug 23, 2007

Hi there,

I am trying here to get a situation going which includes both transactions and checkpoints to make sure that when something goes wrong I don't get a) data corruption (hence the transactions and b) I don't have to completely restart my 2hr run (hence the checkpoints). However I ran into something of which i cannot see whether it is intended behaviour or simply a bug.

Here's the deal:
I have a SSIS-package in which I enable checkpoints (CheckpointUsage: IfExists and SaveCheckpoints: True).
I have 2 Dataflows which follow eachother (the first dataflow prepares data for the second dataflow to edit).
Because I want to make sure that my data is secure I put a separate transaction on both the dataflows.

And here my problem arises. If I run my package now and the second dataflow breaks then my checkpoint sends me back to the first dataflow and my initial insert is executed again, which isn't meant to happen (I enabled checkpoints to prevent rerunning items). Somehow my checkpoint does not register the fact that the first dataflow has already been executed and it will execute that one again upon rerun.

However: if I put a random task between the 2 transacted dataflows (for example an empty script-task) it will work as intended. Just as long as this inserted item doesnt have a transaction; because if it does then the problem comes back
Now if I execute the package then my checkpoint shows that the first dataflow has already been executed and thus it will not execute this one again and it starts at the second dataflow upon re-execution.

I can work around it (with the empty script-task) but still I am wondering as to why this is happening. I am very interested to hear whether this is really a bug or if it is intended behaviour (and if it is then why is it intended?)

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Transactions And Checkpoints Not Working As Expected

May 2, 2007

I have a package that has a container containing multiple DF Tasks.

The container is set to be Transacted, such that should any of the DF tasks fail the data inserted in any of the previous tasks rolls back.

This works as expected.



However, this container is part of a larger package and so I wanted to have a checkpoint on it, so that should any of the tasks within it fail, the package could be restarted from this container.

However, I would expect the functionality to be that on failure, the checkpoint would cause the whole container to be started again (because the container is transacted all DF task info would be rolled back) so we would expect it to start at task 1 again.

This is not the functionality I see. The package restarts from the failed task within the container every time.



According to the book Prof SSIS, it should start again from the first task and as explained this makes sense on a Transacted container as you would want this to happen.



A previous forum message encountered the same issue it appears:

See SSIS Checkpoints 04 Dec 2006.



This is an extract from it:

"I only experimented a little but my experience was that when I have a transacted container with multiple tasks that are checkpointed, SSIS would try to restart from the task that failed rather than from the first task in the container. The transaction was being rolled back correctly though.

In short, I felt that check points were not aware of transactions.

So, I ended up with this setting and it works for me:

Container is checkpointed and trasacted.
Tasks within the container are not checkpointed.
'FailParentOnFailure' property set to True on the tasks.

That way, if a task failed, it would fail the container and a checkpoint would be created at that level. Transaction would be rolled back as usual."



While this makes sense to me it is not the same properties that the SSIS book has that work.

Additionally, this didn't work for me either !!

I have tried every combination of FailPackageOnProperty and FailParentOnProperty that makes sense but every time the package restarts from the failed container within the task.



The transaction is rolled back correctly every time, but it seems the checkpoint that is created is not used correctly when dealing with transactions within containers.

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Dec 4, 2006

I have a package that uses ssis checkpoints. It works well. However, when I try to setup transactions for some task, the chekpoints aren't used.

I read BOL and It states:
"If a package is configured to use checkpoints, Integration Services captures the restart point in the checkpoint file. The type of container that fails and the implementation of features such as transactions affect the restart point that is recorded in the checkpoint file."

But, how checkpoints are affected by transactions? what relation exists between this two components?

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Aug 8, 2007

Hi Guys,

Here i'm back again on the previous problem of Transaction. I think the problem is coming up because in Dataflow1 i'm referring to a Sql Server table and in DataFlow2 i'm referring to the same table and when they're in transaction they're locked.
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Ta
Gemma

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Jul 25, 2006

I want to truncate a table (remove all of its data) using an "Execute SQL task" and then populate that table using a Data Flow task. In case of failure, I want to "rollback" the table to its state prior to its truncation.

Can this be done using SSIS Transaction support or is that support aimed exclusively at sql-based flows?



TIA,



barkingdog

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Dec 24, 2007



Hi Pals,



I have few queries regarding the transaction management in SSIS.


1. I have a SSIS package in which i have a 2 DataFlow Tasks which basically loads 10,000 records in each table.
2. Then i have one Execute SQL Task which contains an 2 UPDATE statements.
The first UPDATE statement update the table1 which has no issues.It is preetty much straight forward.
Inside the 2nd UPDATE statement, i purposefully updating a numeric column with Alphabets. which throws an Exception.
Since I am taking care of Exception Handling in my stored procedure. So my previous UPDATE will get ROLLBACK'ed as

expected.


The catch here is, As the update statement is failed(i.e Txn is Rollabcked). Do i need to Rollback the entire data loads i.e
10,000 recs into Table T1 and table T2.

In such scenarios how do we deal such things in Real Time.
Do we Rollback the Entire Process. Can you please suggest me how do we takle such situations in SSIS.


Thanks & Regards.

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May 21, 2007

Hi,

I made a small SSIS package where I am performing some data transfer operations.

There are two servers A and B

I am getting some data from A , comparing it with some data in Server B and finally inserting some data back in A on the basis of the comparison and logic.

Anyway, the internal logic of SSIS package is not important here. What is important is that since I am deleting the data in Server A before reflooding it from Server B , this SSIS package needs to be in a transaction for obvious data integrity reasons.

I tried to put the "TransactionOption" of the package to "Required" and it fails to acquire connection after that. I do not seem to understand the reason for it because as soon as I revert the transaction option to "Supported" it is able to acquire the connection.

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JCJC - Transactions In SSIS

Nov 15, 2007


Hi,

I am new to SSIS but have been putting together a relatively complex ETL over the last few weeks. However, I have been stuck on the problem below for the last 4 days and to save my sanity, I would appreciate any help or advice.

Thanks in advance,
jc

I have a 'Control_Upload' package which contains 2 transaction containers in series. Being in series, the transactions should never overlap.

The first transaction container exists within a For Each container and contains several 'Execute SQL' and 'Data Flow' tasks. I have set the 'TransactionOption' on the Transaction container to 'Required' and the tasks within the container are set to a combination of 'Supported' and 'NotSupported'. I have set the IsolationLevel on all 'Supported' tasks to 'ReadUncommited'.

On completion, the second transaction is executed.

The second transaction container also exists within a For Each container and contains 2 'Execute SQL' tasks and 3 'Execute Package' tasks. The invoked packages also contain a ForEach Loop and several 'Execute SQL' and 'Data Flow' tasks. Again, I have set the 'TransactionOption' on the Transaction container in 'Control_Upload' to 'Required' and the tasks within the container are set to a combination of 'Supported' and 'NotSupported'. I have set the IsolationLevel on all 'Supported' tasks to 'ReadUncommited'.

I am experiencing 2 different errors which the SSIS configuration described above.

The first error relates to the first transaction. SSIS executes a number of the 'Execute SQL' and 'Data Flow' tasks which are 'Supported' by the transaction, however, it hangs indefinitely (without any warnings or errors) when it tries to execute the final 'Data Flow' task. The initial tasks execute as expected and the transaction completes if I disable the 'hanging' task. When writing data to tables within all 'Data Flow' tasks, I have the 'Data Access Mode' set to 'Table or view - fast load' and have unchecked the 'Table lock'. For this reason, I do not understand why I seem to be experiencing a potential contention lock!?!

The second error relates to the second transaction. The 3 'Execute Packages' are 'Supported' in the transaction. The first 2 seem to execute successfully but the 3rd returns the following error message when executing one of the 'Data Flow' tasks within the 3rd package.

'SSIS Error Code DTS_E_OLEDBERROR. An OLE DB error has occured. Error code: 0x80004005. And OLE DB record is available. Source: "Microsoft SQL Native Client" Hresult: 0x80004005 Description: "This operation conflicts with another pending operation on this transaction. The operation failed."'.

However, the 3 'Execute Package' tasks are connected in series and like the previous transaction, I have the 'Data Access Mode' set to 'Table or view - fast load' and have unchecked the 'Table lock' within all DB destination components. For this reason, I do not understand why I seem to be experiencing a potential contention lock!?!

Any thoughts would be greatly appreciated.

Sorry for the length and apologies in advance for my overuse of '''''' !!!

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Dec 4, 2007



I have an SSIS Package that loads data to a SQL Server table and also logs package statistics along the way with individual SQL statements. In the event of failure, I want the data loaded to the target table rolled back but I want the statistics updates saved to the database. My package consists of several Execute SQL tasks that handle the logging and a Data Flow task that loads the data to the target table along with a couple of event handlers to handle errors. I have the Transaction Option property on the Package set to Required, to Supported on the Data Flow, and to Not Supported on the Execute SQL tasks and the OnError Event Handlers.

When we run the package (and cause an error) everything runs fine until it gets to the On Error event handler for the Data Flow task. This task hangs and never finishes. If we set the Transaction Option for the Event Handler to Supported (allowing it to enlist in the parent transaction) it works but the updates that it makes roll back along with the data from the Data Flow.

Is there a problem with having Event Handlers stay out of a transaction started by the parent package?

Any help would be appreciated.

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Hi:

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Hi All,

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The package was running absolutely fine until we changed the Transaction property of the Package to "Required".
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Anybody has encountered such a problem with Transactions in SSIS?

Thanks in advance.

Regards,
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I want to use a checkpoint in an SSIS package and would require some help.



I have a scenario like this

Task A ------ Task B-----------Task C

------- Task B1



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I would like Task B1 to be a script task that is used to fail Task A so that when the package is restarted it will start from task A based on the checkpoint.

Is there any way to do this ?

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I have a package that has 4 Script Tasks that are placed sequentially.



I have Task1--> Task2-->Task3-->Task4



The arrows between them are OnCompletion Arrows as opposed to the Standard OnSuccess arrows.Even if Task2 failed, it would still execute 3 and 4



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Any suggestions would be helpful



Thanks for any help in advance..



smathew

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Mar 6, 2008



hi people, i have crashed on a this problem. I have a sequence container and on this container I have set "FailPackageOnFailure=true". Now in this container there are 2 tasks. The first one is preceeding the second one. Now both this task have set "FailParentOnFailure=true". Both task are the same and their purpose is to drop table A.

1) I run the package and it fails, because there is no table to drop.
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Context:
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Thanks, in advance,
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