Monday, September 20, 2004

Metadata-Driven Data Warehouse

The topic of the metadata-driven (MD) data warehouse - along with the Common Warehouse Metamodel (CWM) - subject of code generation & logic rule systems fascinates me...

Having working in corporate environments where the core business I was involved in was data validation & data warehouses, I can't believe more effort hasn't been directed to this area. The reason for my focus on this is that I am currently involved in delivering (in the 3 weeks I have left!) a MD code generation system which will use SQL code behind the scenes to build a relatively simple data warehouse with basic ETL steps... Why code generation for the data warehouse?

First, I'll start by stating that I believe there are 3 symptoms that you can diagnose early to determine if code generation should be used on a project:
Repeated logic - the same (or very similar) thing happening to different stuff everywhere. Hard coded logic rules - the description of "what" we do to our data isn't abstracted from the way the system actually works unconstrained conceptual entities - Things that are the conceptually same in two places but represented either differently or separately, don't share a relationship.

So an initial approach of specifying user requirements, designing the data warehouse and building it iteratively was not as appealing to me this time around. Having been involved in a few data warehouse projects I have come to learn that the initial design is generally flawed and needs modification in order to be supported into the future. This approach is generally focused at the schema of the data warehouse. Spec the needs, design the schemas, build the schemas, and tack on some ETL logic to make it work. As almost a rule, it doesn't, but that's OK. That's what iterative development is all about. But in this case, the way the system works is already spliced into the schema of how we want the data presented to the user... This means that if we need to fundamentally change the way we treat our dimensions, we have to change reams of code and try not to break anything... and plenty of other nasties.

At the system level, a typical system design goal is usually something like this - "Create a data warehouse that allows users to get access to data collected by the corporate financial data application..." The unfortunate temptation is to go off and spec a corporate financial data warehouse. But - what is "corporate financial"? The conceptual answer (eg the column names, data items, business rules etc) usually surfaces - Corporate financial is "Year","Month","Revenue" etc. So in many cases, the coding is also done at the conceptual level. The real answer to our question is that Corporate Financial is a data collection - that can be easily described with metadata as a collection of inputs, outputs, definitions, relationships, procedures and rules.

It is about at this point that the whole thing turns sour - by ignoring the basic facts about the metadata of what we want to present, we lock ourselves into certain way of doing something, which can be a nightmare to develop, debug and deploy.

The common result of this solution is that the project is never 'finished'. The end of the financial year rolls around, and the users want new items in the data collection... It's up to the developers and DBA's to hack the scripts to get them through. What kind of development team wants to be doing code maintenance ad infinitum? That detracts from time spent developing new stuff. The goal should be to pass the bulk of the logical & conceptual maintenance tasks back to the application owners.

The MD approach generally takes longer that seat-of-your-pants coding, but delivers long term gain. It should also be noted that MD doesn't fix all bugs; it just limits their occurrence to bad modeling decisions, rather than coding errors.

This type of approach lends and extends from many others - CWM, Configuration Management, Virtual Machines, Rule-Based programming and many others. This stuff isn't rocket science, nor is it a new concept, but it seems many architects are still avoiding MD solutions

In my next post I'll talk about a few simple ways to implement MD design in different applications.


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