What is DMR in Cognos? DMR is a modelling technique from Cognos. DMR stands for Dimensionally Modelled Relational and Cognos refers to the developer of various software involving business intelligence. Cognos is also considered a big name in the field of business intelligence providing various tools for large companies and enterprises. Now under the IBM group, Cognos is considered one of the largest suppliers of business intelligence software and tools to the entire globe.
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For example, users with limited vision might prefer to use Cognos Cube Designer because of accessibility features that Framework Manager does not offer. Some objects that are used when modeling dynamic cubes are not compatible with relational and DMR metadata. Such objects include: virtual cubes, parent-child dimensions, relative time dimensions, named sets, calculated measures, and calculated members.
Differences when modeling with Cognos Cube Designer and Framework Manager Framework Manager is a mature product that has benefited from many years of iterative improvements to its user experience. View context diagram for modeling relationships. View data for query items from different query subjects. View generated SQL for a selection of objects. Copy and paste query subjects.
Modeling with Framework Manager is an iterative process of refining different views, or layers, of your metadata, starting with the data source view, then the business view, and finally the presentation view that your users consume. The modeling approach with Cognos Cube Designer is streamlined to focus entirely on the reporting application and ensure that a quality model is defined and deployed.
Cognos Cube Designer guides your modeling activities to allow you to succeed in your reporting requirements. In Framework Manager, you create data source query subjects by importing tables and views from your data source into your model. You also create model query subjects that are not generated directly from a data source, but are based on query items in other query subjects, including other model query subjects.
A query subject in Cognos Cube Designer has similarities to the model query subject in Framework Manager. In Cognos Cube Designer, you first create a query subject and then add query items from your data source to it.
Similarly to how model query subjects in Framework Manager provide an insulating layer from schematic changes to the data source, query subjects in Cognos Cube Designer remain static from a reporting perspective while their underlying implementation is updated to reflect the new database structure. In Cognos Cube Designer, you can also create a query item set to obtain an abstract, business-oriented collection of query items. In Framework Manager, you associate security filters with users, groups, and roles whose unique identifiers are stored within the model.
In Cognos Cube Designer, you create security filters within named security views. You then associate the security views with users, groups and roles; these associations are stored in your Content Manager instances.
What is DMR in Cognos?
Nagul As long as you create a snowflake or star schema that has relationships of many-to-one from the inside out, clean things up, denormalize it, and etc, you should be okay. At least one path in the hierarchy skips at least one level. A query subject in Cognos Cube Designer has similarities to the model query subject in Framework Manager. A multi dimensional analysis is a technique to cgonos the data so that users can view the data at different levels of details. To test it, click on the blue play button and it should show you the correct results like in the picture below:. Query subjects are organized in a way that business users can understand.
DMR’s pros and cons
You can import metadata only from a Content Manager data source. You must perform a separate import for each schema that you want to use. A separate file is created for each data source from which you import metadata. This is required by dynamic query mode.
Relational and DMR modeling in Cognos Cube Designer
IBM Cognos Model Types