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SammyPub
Frequent Visitor

Fact vs Dimension

Hi,

 

I have a fact table with 5M rows.

Some columns only have two distinct values "Y" and "N". In my report I will use the columns as slicers. Should I create a dimension table for these columns or not. Will the report performance get better with the dimension table or not?

 

Thanks

1 ACCEPTED SOLUTION
HashamNiaz
Solution Sage
Solution Sage

Hi @SammyPub !

 

You can create a dimesion with simple 2 value and another surrogate key with tinyint 0/1, you can save this tinyint value in your fact table. Current [Y/N] are storing as char and taking more space than tinyint.

 

Also, when you use [Y/N] from fact table for slicer your query is hitting 5M rows, instead you can use dimension to get slicer selection.

 

Hope you understand the performance benefit.

 

Regards,

Hasham

View solution in original post

1 REPLY 1
HashamNiaz
Solution Sage
Solution Sage

Hi @SammyPub !

 

You can create a dimesion with simple 2 value and another surrogate key with tinyint 0/1, you can save this tinyint value in your fact table. Current [Y/N] are storing as char and taking more space than tinyint.

 

Also, when you use [Y/N] from fact table for slicer your query is hitting 5M rows, instead you can use dimension to get slicer selection.

 

Hope you understand the performance benefit.

 

Regards,

Hasham

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