cancel
Showing results for 
Search instead for 
Did you mean: 
Reply
hwr7dd
Frequent Visitor

Data Modeling Large Number of Facts

Hello, 

Im working with healthcare data that is rolled up by day and unit inside of each individual hospital. It looks something like this:

DateUnitBeds FilledRNsBeds NeededCovid
1-1-20192352422519
1-1-2019897564151001

 

I have two other dimension tables. A date dimension table and a hierarchy table that I use to drill down the fact table with. For example the client can drill down to a particular hospital or unit type with the hierarchy table. 

The issue is that I have 3 or 4 data sources each with 20-30 metrics. Im concerned that if I joined all of them together, my fact table would be 100+ columns wide and my data model would take forever to refresh. Should I join them all so that I have a true "star schema" data model or keep them split up in a "constellation" model. 

2 REPLIES 2
KNP
Responsive Resident
Responsive Resident

@hwr7dd - A star schema is always preferred in Power BI. My advice based on the info you've given would be to join them and then remove all columns that are not used in the reporting. There's always the temptation to keep columns you may need but I would advise to get rid of them until you actually need it. 

hwr7dd
Frequent Visitor

Unfortunately this is the truncated model. We have well over 300 metrics that we "could" report on that have been left out. The model that needs to be developed is fairly specific to healthcare/IoT as it has an unusual amount of facts and a low amount of dimensions. 

Helpful resources

Announcements
MBAS on Demand

2021 Release Wave 2 Plan

Power Platform release plan for the 2021 release wave 2 describes all new features releasing from October 2021 through March 2022.

July 2021 Update 768x460.png

Check it out!

Click here to read more about the July 2021 Updates

Power Query PA Forum 768x460.png

Check it out!

Did you know that you can visit the Power Query Forum in Power BI and now Power Apps

Urdu Hindi D365 Bootcamp 768x460.png

Urdu Hindi D365 Bootcamp

Dont miss our very own April Dunnam’s The Developer Guide to the Galaxy! Find out what the Power Platform has to offer for the traditional developer.

Top Solution Authors
Top Kudoed Authors