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Debugging and Error Handling in SSIS
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BEST PRACTICES manage muLtipLe tasKs With transactiOns anD restartabiLity
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Sometimes you will need to roll back a series of tasks if one of the tasks fails, but you want to go back only to the point of failure, not to the start of the package. To do this, you need to enable checkpoints in the package and then use a Sequence Container that holds all the associated tasks. The Sequence Container needs to have the transactions turned on by setting the Transactionoption to Required at the container level.
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implementing package and task transactions
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In this practice, you will turn on transactions at the container level and observe the results when a task fails within the container. You will also enable checkpoints for a package and observe the results.
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e xercise 1
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Enable Transactions and observe a Transaction Rollback
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In this exercise, you will enable a transaction for a Sequence Container and observe the data results after an error occurs in another task within the same container.
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In Control Panel, select Administrative Tools and then Services to open the Services console. If necessary, start the Distributed Transaction Coordinator (MSDTC) service. Open the SSIS project named TK 70-448 SSIS Project in SQL Server Business Intelligence Development Studio (BIDS) that you created in 1, Developing SSIS Packages, and then open the package named MyPackage.dtsx. Alternatively, you can use the 448-ch02 Start Here project in your Documents\Microsoft Press\MCTS Training Kit 70-448\Source\Ch 02\ folder. Choose Properties Window from the View menu to open the Properties window. Click the Auto Hide button, which resembles a pushpin, in the Properties window to lock the window in the open position. In the Control Flow design surface, select the Sequence Container object by clicking it, and then note the Sequence Container properties listed in the Properties window. Set the TransactionOption property to Required using the drop-down list. Save the package by clicking the Save button on the toolbar. Next, drag a new Execute SQL Task from the toolbox to the bottom of the Sequence Container workspace just below the Data Flow Task. Connect the Data Flow Task to the new Execute SQL Task by dragging the output arrow from the bottom of the Data Flow Task onto the Execute SQL Task.
4. 5. 6. 7. 8.
Lesson 1: Configuring Package Transactions and Checkpoints
Edit the Execute SQL Task by double-clicking the task.
a. In the Execute SQL Task Editor dialog box, change the Connection property to the
AdventureWorks2008 connection.
b. Modify the SQLStatement property and type the following statement:
SELECT CONVERT(int,ProductLine) FROM Sales_Summary
This SQL code intentionally forces an error in the Execute SQL Task when trying to convert a text value to an integer. Click OK to close the Enter SQL Query dialog box.
Change the Name property within the Execute SQL Task Editor dialog box to force failure. design surface. Figure 2-5 shows what your control flow should look like with the new Execute SQL Task.
d. Click OK in the Execute SQL Task Editor dialog box to return to the Control Flow
figure 2-5 The new Force Failure Execute SQL Task in the MyPackage.dtsx package is added below the Data Flow Task.
10. 11.
Open SQL Server Management Studio (SSMS) and connect to the Database Engine. Open a new database query against the AdventureWorks2008 database. Run the following SQL statement, and then observe the results:
SELECT COUNT(*) FROM Sales_Summary
Return to BIDS, and then execute the SSIS package you just modified, which intentionally fails at the last step. Before stopping the package in Debug mode, open the Data Flow Task and note that the SSIS Designer shows a couple thousand rows inserted into the Sales_Summary table. Stop the package execution, and then rerun the query from step 11. You should see the same number of rows. Observe that even though the Data Flow Task was successful, the data was rolled back. This is because the Sequence Container was configured with the TransactionOption setting as Required and the last task within the Sequence Container failed, therefore rolling back the Data Flow Task data.
13. 14.
Debugging and Error Handling in SSIS
e xercise 2
Set and observe Checkpoints in a Package
In this exercise, you will turn on checkpoints in the DimCustomer.dtsx package and observe how checkpoints work when an error occurs.
If necessary, start SQL Server Business Intelligence Development Studio (BIDS), open the project TK 70-448 SSIS Project, and then edit the DimCustomer.dtsx package by double-clicking it in Solution Explorer. Open the Properties window on the Control Flow tab, and then change the following package-level properties:
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