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You're reading from SQL Server 2017 Integration Services Cookbook

Product typeBook

Published inJun 2017

Reading LevelIntermediate

PublisherPackt

ISBN-139781786461827

Edition1st Edition

Languages

SQL

Tools

SQL Server

Concepts

Database Administration

Authors (6):

Christian Cote

Dejan Sarka

David Peter Hansen

Matija Lah

Samuel Lester

Christo Olivier

View More author details

Designing patterns to load dimensions of a data warehouse

The difference between these patterns is the way historical data is stored in the dimensions. We call them Slowly Changing Dimensions (SCD). The following points give an overview of various SCD types:

Type 0: This retains the original. This means that any changes to a specific member of the dimension will result in a new member inserted with new values. As opposed to SCD type 2, there's no concept of the current version or start and end date of a row. This SCD type is rarely used.
Type 1: This overwrites changes, no history is kept. For example, let's say we have a person's marital status attribute in a claimant dimension. If the initial value at insertion was Single, the attribute value is updated to Married when the person gets married.
Type 2: This keeps history (versioning). A bunch of system columns are added to the dimension:
- The start and end date of the dimension member (row). Usually, the start date equals the date when the...

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SQL Server 2017 Integration Services Cookbook

Published in: Jun 2017Publisher: PacktISBN-13: 9781786461827

Authors (6)

Christian Cote

Christian Cote is an IT professional with more than 15 years of experience working in a data warehouse, Big Data, and business intelligence projects. Christian developed expertise in data warehousing and data lakes over the years and designed many ETL/BI processes using a range of tools on multiple platforms. He's been presenting at several conferences and code camps. He currently co-leads the SQL Server PASS chapter. He is also a Microsoft Data Platform Most Valuable Professional (MVP).
Read more about Christian Cote

Dejan Sarka

Dejan Sarka, MCT and Microsoft Data Platform MVP, is an independent trainer and consultant who focuses on the development of database and business intelligence applications. He is the founder of the Slovenian SQL Server and .NET Users Group.
Read more about Dejan Sarka

David Peter Hansen

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