Question

The ________ slowly changing dimension approach creates a new additional dimension record using a new value for the surrogate key every time a value in a dimension record changes.
A) Type 1
B) Type 2
C) Type 3
D) Type 0

Answer 1

The type 2 slowly changing dimension approach creates a new additional dimension record using a new value for the surrogate key every time a value in a dimension record changes. The correct answer is B.

Understanding the Slowly Changing Dimension

SCD, or slowly changing dimension, can be defined as a dimension in a data warehouse that stores and maintains the current data and the historical data over time. A slowly changing dimension in a star schema contains two different attributes values: do not change and change occasionally. Here is the difference:

1. Attributes whose values do not change (or change very infrequently), including such store size and client gender.
2. Attributes whose values vary intermittently and irregularly throughout time, such as customer zip code and staff salary.

The three most common approaches for coping with slowly changing dimensions are as follows:

• Type 1
• Type 2
• Type 3

Whenever a value in a dimension record changes, type 2 of a slowly changing dimension produces a new extra dimension record with a new value for the surrogate key. This type is also utilized when history needs to be kept, and it may be paired with the usage of timestamps and row indications.

Learn more about data storage here: brainly.com/question/26207955

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