Home » Microsoft » 70-463 » What should you use?
You are creating a SQL Server Integration Services (SSIS) package that implements a Type 3 Slowly Changing Dimension (SCD).
You need to add a task or component to the package that allows you to implement the SCD logic.
What should you use?
A. a Data Conversion component
B. an Execute SQL task that executes a MERGE statement on the database
C. a Merge component
D. an Expression task
Correct Answer: C
Explanation/Reference:
Explanation:
Note: Type of Slowly Changing Dimensions
Slowly Changing Dimensions are categorized into three types named: Type 1, Type 2, and Type3. The Type 1 SCD does not maintain the history of changing attributes, it overwrites values of the attributes. Type 2 maintains historical values for changing attributes. Type 3 that we do not use much maintains separate columns for changed attributes. SSIS SCD wizard supports both Type 1 and Type 2.
Using MERGE instead of SCD wizard
Replacement of SCD wizard with MERGE is not a straightforward technique. If the SCD has both Type 1 and Type 2 types attributes, they need to be handled separately.
