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Apr 30, 2020 at 02:20 PM

What will be benefit of surrogate key in data warehouse layer?

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Hello Experts,

OLTP source tables are having surrogate keys (numeric values) and natural keys (alphanumeric values), then can I skip creating surrogate keys in target OLAP DB (Dimensional Model) for dimension tables.
I know that I will need surrogate keys for fact tables as unique key for fact table will be a large set and I will need a single columns with numeric values as primary key there.
I am joining multiple source tables for populating data into one dimension target then I am wondering to use unique id (numeric values) of driving table (this id is inherited from OLTP source) as primary key , provided that data granularity of resulted record is at driving tables' id level (resulted record is the record after main source driving table is joined with other source tables).

What will be benefit of surrogate key in data warehouse layer?

Thanks,
Rajneesh