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Data & Intelligence

IBM Cognos TM1 and a Relational Mind




For a long time relational models have supported the ability to create virtual tables known as “views” to provide a mechanism that allows developers to customize how their users can logically view data stored in base tables.

There is a similar concept in Cognos TM1 known as “virtual cubes”. A virtual cube is a cube that contains no physical data but though TM1 rules refers to and displays data that persists within a TM1 server.

If we use a virtual cube, we are not restricted to the dimensionality of a particular cube or cubes; in fact, we can combine or dissect dimensions, perform mathematical calculations, and filter or summarize slices of data to create a view that is the most optimal to a particular user, group or reporting need.

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Why not just build cubes that way in the first place?  Well, in the first place, you model your cubes to support analytical analysis.  This means breaking apart data into (the simplest) chunks that you need to report on – this breakout supports potentially endless “slicing and dicing” but can create extra work when building reports -as a report more realistically will want to see rows with columns showing totals that are based upon a combination of dimensions.

Cube Viewer

Virtual cubes will extend the usefulness of TM1’s Cube viewer since virtual cubes are not restricted by the dimensionality of a cube users can create views that are more conducive for general reporting and therefore eliminate (or at least reduce) the need for more “formal” reporting options such as a TM1 Web sheet or Cognos BI report.


Virtual cubes can also be used to simplify security. Granting access to a particular cube is always easier to implement than element of cell security models. Virtual cubes can be the mechanism that restricts users to a certain subset of data in one or more base cubes.


Virtual cubes can also be defined to provide system performance benefits, improving data access on the most complex queries by precomputing and materializing a view of data.


To be sure, virtual cubes are not a slam dunk – careful consideration must go into their design and implementation – but they certainly deserve an earnest evaluation before your next TM1 implementation.

“We all live every day in virtual environments, defined by our ideas” – Michael Crichton


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Jim Miller

Mr. Miller is an IBM certified and accomplished Senior Project Leader and Application/System Architect-Developer with over 30 years of extensive applications and system design and development experience. His current role is National FPM Practice Leader. His experience includes BI, Web architecture & design, systems analysis, GUI design and testing, Database modeling and systems analysis, design, and development of Client/Server, Web and Mainframe applications and systems utilizing: Applix TM1 (including TM1 rules, TI, TM1Web and Planning Manager), dynaSight - ArcPlan, ASP, DHTML, XML, IIS, MS Visual Basic and VBA, Visual Studio, PERL, Websuite, MS SQL Server, ORACLE, SYBASE SQL Server, etc. His Responsibilities have included all aspects of Windows and SQL solution development and design including: analysis; GUI (and Web site) design; data modeling; table, screen/form and script development; SQL (and remote stored procedures and triggers) development and testing; test preparation and management and training of programming staff. Other experience includes development of ETL infrastructure such as data transfer automation between mainframe (DB2, Lawson, Great Plains, etc.) systems and client/server SQL server and Web based applications and integration of enterprise applications and data sources. In addition, Mr. Miller has acted as Internet Applications Development Manager responsible for the design, development, QA and delivery of multiple Web Sites including online trading applications, warehouse process control and scheduling systems and administrative and control applications. Mr. Miller also was responsible for the design, development and administration of a Web based financial reporting system for a 450 million dollar organization, reporting directly to the CFO and his executive team. Mr. Miller has also been responsible for managing and directing multiple resources in various management roles including project and team leader, lead developer and applications development director. Specialties Include: Cognos/TM1 Design and Development, Cognos Planning, IBM SPSS and Modeler, OLAP, Visual Basic, SQL Server, Forecasting and Planning; International Application Development, Business Intelligence, Project Development. IBM Certified Developer - Cognos TM1 (perfect score 100% on exam) IBM Certified Business Analyst - Cognos TM1

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