SQL Server Integration Services in VB.NET

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SQL Server Integration Services
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4. Which of the following built-in roles, when appropriately assigned, are able to export all packages (Choose all that apply.) A. db_dtsadmin B. db_dtsltduser C. db_dtsoperator
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Lesson 3: Troubleshooting SSIS Packages
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Lesson 3: Troubleshooting SSIS Packages
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As any developer will tell you, rarely does any program work entirely correctly the first time it is executed. The same logic applies to SSIS packages. Only if you are extremely lucky does everything work the way you envision it when you first execute an SSIS package. In light of this reality, BIDS ships with many tools that you can use to debug your SSIS packages prior to deploying them in a production environment. These tools range from checkpoints, which allow you to restart a package from its point of failure rather than re-running the entire thing, to extensive logging options and breakpoints.
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After this lesson, you will be able to:
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Restart failed packages. Troubleshoot or debug packages.
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Estimated lesson time: 30 minutes
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Package Checkpoints
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Package checkpoints are a technology that allows packages to be restarted from the point of failure rather than re-executing the entire package. This feature can save a lot of time and effort, especially if the package fails during a minor task at the end of an exhaustive execution. The following is a list of examples that show the benefits of implementing checkpoints in SSIS packages:
If a package uploads 10 large files by using the FTP task and the ninth file fails to upload, checkpoints enable that single file to be uploaded when the package is restarted rather than having to re-upload all 10 large files. If a package uses 20 different Bulk Insert tasks into different dimension tables and one of the Bulk Inserts fails, the use of checkpoints would mean that when the package was restarted only the failed task, and not the 19 others, will be retried. If a package computes 30 separate aggregates using 30 separate Data Flow tasks and one aggregation fails, restarting the package forces only the failed aggregation to be performed again rather than all 30.
Task host containers, Foreach Loop containers, and transacted containers are the smallest part of the work flow that can be restarted using checkpoints. If you want to use checkpoints, you should limit the number of tasks that you put in these types of containers as much as possible. The more granular you make your checkpoints, the more effective they are in stopping the repetition of unproblematic tasks.
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SQL Server Integration Services
Note that if a package fails during the execution of a transacted container, SQL Server rolls back any alterations made by the tasks in that container. When the package restarts, SQL Server reruns the transacted container from the beginning. Because a transacted container is the smallest part of the work flow that can be restarted, any of the transacted container s child containers that successfully executed prior to failure are rolled back and have to run again when the package is restarted. This has important implications for the integrity of data. For example, in cases where a series of changes are made, having half the tasks execute might be worse than having none of them execute. This same data integrity issue applies to the child containers of Foreach Loop containers. When SQL Server restarts the package, the entire Foreach Loop container runs again. However, because this is not a transacted container, any changes made by child containers of the Foreach Loop containers that successfully ran prior to the package failing will be retained. Foreach Loop containers do not allow the rollback of changes if some aspect of the Foreach Loop container s execution fails. Checkpoint files are used to monitor and manage the execution of packages that contain checkpoints. The checkpoint file is created when the package starts to execute, and it is removed after successful package execution. Checkpoint files are similar in many ways to bookmarks that SSIS can use to restart a package from its point of failure. Checkpoint files record the following information:
The type of container that failed Current values of variables (other than those that are of the Object data type) Whether the failure occurred part way through the execution of a transaction
You should note that package configurations are ignored when packages are restarted because all the necessary information is drawn from the checkpoint file. Also note that packages can be restarted only at control flow levels, not at data flow levels. This will affect package design because you will want to minimize the number of data flows in any single data flow task. To configure checkpoints, you need to configure the package properties fields listed in Table 7-3.
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