This documentation supports the 9.1 to 9.1 Service Pack 3 version and its patches of BMC Atrium Core. The documentation for version 9.1.04 and its patches is available here.

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How federation extends the data model

Just as important as knowing how to extend the CDM is knowing when to extend it. Some situations are better addressed by storing data somewhere other than your CMDB or by using existing classes and attributes.

The CMDB should hold only common CIs and their relationships. Adding classes and attributes for unimportant CIs taxes your CMDB. Also, creating too many subclasses can leave you with classes so narrowly defined that they hold very few instances. Balance the need for categorization with the need to store similar CIs together.

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