Truncate always checked for the some of the dimension tables

Hi,
I found common dimension tables across Finance,Supply Chain and Sales by querying in DAC.
In the task level most of the target tables checked as Truncate For Full Load.
but some of the tables defined as truncate always, why they defined as truncate always is there any specific reason for that.
Truncate Always Dimension Tables List:
W_FSCL_MONTH_D
W_FSCL_QTR_D
W_FSCL_WEEK_D
W_FSCL_YEAR_D
W_HOUR_OF_DAY_D
W_MONTH_D
W_QTR_D
W_TIME_OF_DAY_D
W_WEEK_D
W_YEAR_D
Thanks and Regards,
Partha.

Hi,
If they are defined as truncate always it is because the mapping which loads the table is always filling it with a full set of data not an incremental. If the table wasn't truncated every time then the data would not be correct after an ETL.
You can see from that list that they are all time defined tables which are being truncated. These can be truncated and refilled without worry of breaking data integrity because the ROW_WIDs for these tables are not truly surrogate keys, they hold some meaning. So for instance the row_wid for the row for Jan 1980 in W_MONTH_D is 198001 and it will always have this same ROW_WID after each ETL, meaning the dimensions can be truncated and fully rebuilt without invalidating any joins to it from fact tables.
Regards,
Matt

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