Verify the model in your existing environment 
.
Open and upgrade the model .
Verify and repair the model .
Upgrading a model prepares the model to take advantage of the new features in Cognos 8.3.
To upgrade your model, follow these steps:
Verify the model in your existing environment .
Open and upgrade the model .
Verify and repair the model .
The upgrade process does not resolve any problems that existed in your model prior to upgrading. Before upgrading the model, we recommend that you verify your model and fix any reported problems in your existing environment.
When upgrading from Cognos 8.1 or 8.2 to Cognos 8.3, all you need to do is verify the model and fix errors.
When you open an older model in Framework Manager, you are notified that the model must be updated.
When upgrading from Cognos 8.1 or 8.2 to Cognos 8.3,
you should understand the impact of governors that are set during
upgrade .
If you are upgrading a model that is segmented or linked, see Upgrading Segmented and Linked Projects.
Several governors are set automatically during the upgrade process:
The Shortcut Processing governor is set to Automatic.
This governor controls how shortcuts are processed by Cognos 8. When the governor is set to Automatic, the model works the same as in ReportNet, that is, a shortcut that exists in the same folder as its target behaves as an alias, or independent instance. However, a shortcut existing elsewhere in the model behaves as a reference to the original. When you create a new model, the Shortcut Processing governor is always set to Explicit.
The Suppress Null values for SAP BW data sources governor is selected for SAP BW metadata only.
This controls the creation of outer joins in models based on SAP BW metadata.
Some queries can be very large because null values are not filtered out. Null suppression removes a row or column for which all of the values in the row or column are null (empty). Null suppression is performed by SAP BW. This reduces the amount of data transferred to the Cognos 8 studios and improves performance.
After updating the metadata, Framework Manager prompts you to verify the model. We recommend that you verify one namespace at a time in large models. You can also verify an individual object.
When upgrading from Cognos 8.1 or 8.2 to Cognos 8.3, you need to select and repair objects.
The repair process first evaluates all selected items. This evaluation automatically resolves issues with new data types and prompts you to repair dimension information in the model.
You can select one or more check boxes of items and repair them.
