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Just getting started - Beginner question
I'm completely new to OLAP and the PALO Excel Add-in. I have a basic understanding of the snowflake data warehouse schema, but I'm confused as to how that translates into the PALO Modeller.
There are very few tutorials on YouTube, none of which explain any of this.
Hi,
Palo is not restricted to a certain source scheme, therefore there is no special manual for your approach. A Snowflake scheme is a good starting point. Some points you may have to consider are:
- transfer your "flakey" dimension tables back. So if you have normalized separate tables for city/region/country you may create a separate table that collects the information. From this table you could create
your geographical dimension including a hierarchy. There are a lot of examples in the Palo sample dbs and manuals. You may create a view layer for this on top of your DWH. Consider your Snowflake schema as a universal data provider that serves many frontends/data marts. With Palo you are probably connecting to a part of the DWH.
- distinguish dimension elements from (OLAP-)attributes
- regarding time dimension(s) you need to decide if you need one ( e.g. Year/month/Date) or two or more. There are some topics in this forum discussing this question.
- create a separate dimension containing the measures of your fact table. You can create hierarchies within this dimension as well.
- use readable element names instead of technical id's from your source system or concatenated names (id + name)
Take a look at the examples that come with Palo and you wil get ideas on how your final model should look like with respect to your requirements. HTH