I'm working on the production of a Data Warehouse
with SSIS
, and today we create the first dimension with SCD of type 2. The fact table is linked in the DIM_CIPESSOA
dimension through the idcipessoa
column.
When updating the dimension, as shown below, a new PK is generated and with this we need to update the FK in the fact table to connect the lines correctly.
Dimension Table:
idcipessoa cgccpf_AltKey tppessoa nomepessoa effectiveDate expiryDate IsCurrent
----------- -------------- -------- ----------------- ------------------------ ------------------------ ---------
88393 00000000001 1 CUSTUMER OLD 2018-04-02 11:52:47.040 2018-04-02 22:29:05.243 0
169852 00000000001 1 CUSTOMER UPDATED 2018-04-02 22:55:08.540 9999-12-31 23:59:59.997 1
Fact Table
idFact idcipessoa tppessoa
------- ----------- --------
1 88393 1.99
So, as in the example above, we need a strategy to align the fact table to be pointed to the new new key 169852
.
Best Answer
No, you wouldn't update the fact table.
The fact record is tied to the version of the customer which existed between 2018-04-02 11:52:47.040 and 2018-04-02 22:29:05.243 in which they had a 1.99 tppessoa
If they generated a 3.1 tppessoa at 2018-04-03 00:00:00.000 then your fact table would look something like
Then you can see the activity for this customer as they have changed over time.
If you wanted to have the fact table's idcipessoa updated as the dimension changes, that's not a type dimension.