code 128 algorithm c# Lesson 1: Configuring Package Transactions and Checkpoints in C#.NET

Encoder Code128 in C#.NET Lesson 1: Configuring Package Transactions and Checkpoints

Lesson 1: Configuring Package Transactions and Checkpoints
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Implementing Restartability Checkpoints
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Sometimes you want the ability to restart a package if it fails and have it start at the point of failure, especially if you are working with complicated or long-running packages. In other words, you might not want successfully completed tasks to run again if you restart the package. You can accomplish this restartability by enabling checkpoints in the package. Enabling restartability within a package requires first enabling a package to use checkpoints and second setting the specific tasks and containers to write checkpoints. To turn on checkpoints within a package, follow these steps:
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1. 2. 3.
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Within the package, open the Properties window if necessary, and then click the Control Flow tab of the SSIS Designer, which will reveal the package properties. Set the SaveCheckpoints property at the package level to True. This allows SSIS to save checkpoints during package execution. For the CheckpointFileName property, provide a valid path and file name to a checkpoint file. Packages use files to maintain their state information, so if a package fails and is then restarted, the package can read the checkpoint file to determine where it left off and to track the state information at the last successful task. Set the CheckpointUsage property to IfExists, which causes the package to run from the beginning if the checkpoint file is not present or to run from the identified point if the file exists.
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If you set the Checkpointusage property to Always, the checkpoint file must be present or the package will not start. In addition, using checkpoints is not allowed if you have set the Transactionoption of the package to Required.
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Figure 2-2 shows the package properties, highlighting the checkpoint properties set in steps 1 through 4.
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After you enable checkpoints in a package, the final step is to set checkpoints at the various tasks within your package. To do this, set the FailPackageOnFailure property at each task or container to True.
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In the previous example, the Truncate Update Table, Data Flow, and Batch Updates Tasks have the FailPackageOnFailure property set to True.
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Debugging and Error Handling in SSIS
figure 2-2 Setting checkpoint properties for a package requires modifying the package-level properties CheckpointFileName, CheckpointUsage, and SaveCheckpoints.
After you have performed steps 1 through 5 to set up checkpoints for your package, including the control flow objects, your packages are set up to restart in case of failure. Here is what happens when you run a package that has checkpoints enabled:
The package checks to see whether the checkpoint file exists.
If the checkpoint file does not exist, the package begins at the first task (or parallel tasks) in the control flow. If the checkpoint file does exist, the package reads the file to find out where to start (including updating the value of variables and connections at the time of the last failure).
At each successful checkpoint in the package (when the Data Flow Task has FailPackageOnFailure set to True and the task is successful), the checkpoint file is updated.
Lesson 1: Configuring Package Transactions and Checkpoints
3. 4.
If the package fails, the checkpoint file stays in the file system and keeps the last update it had from the last successful checkpoint. If the package is successful, the checkpoint file is deleted. Therefore, the next time the package runs, the checkpoint file will not exist, and the package will start from the first task(s).
Figure 2-3 shows the first execution of the package. At this point, no checkpoint file exists, so the package begins at the Execute SQL Task.
figure 2-3 During the first execution of this package, the Truncate Update Table Task succeeds and is
green, and the Data Flow Task fails, and is red.
During the execution of the control flow shown in Figure 2-3, the Truncate Update Table Task succeeds, and SSIS writes a checkpoint to the checkpoint file. However, the Data Flow Task fails, which does not update the checkpoint file, and the package stops. At this point, the failure is corrected in the Data Flow Task, and the package is rerun. Figure 2-4 shows the control flow of the rerun package. As you can see, this package failed at step 2 of the first run. After the problem was corrected, the second execution of the package started at step 2 and continued to completion.
figure 2-4 During the second execution of this package, the Data Flow Task is the first task to run, and the package finishes to completion.
After completion of the last step, called Batch Updates in Figure 2-4, the checkpoint file was deleted.
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