Design and Development
This is the actual start of your Data Warehouse project. Following things needs to executed in this step. 1. Design a data model based on requirement analysis. It could be star schema or snowflake...
View ArticleTesting
Having a testing plan ready in advance is always advisable as it also help the development steps to test it timely. Once data warehouse is ready and ETL transformation is in place get all the...
View ArticleDeployment and Training
Development is over and testing results are quite good. There are no major bugs or issues. Data quality is good, ETL is doing its job well. Now we are ready to roll out the data warehouse for actual...
View ArticleEnhancements and Helpdesk
Once the new data warehouse is deployed and its in use. You will get lot of enhancement and change request as users will see a new system and new ideas will pop in their mind. be ready. Also make sure...
View ArticleData Warehousing Concepts and Data Warehouse Project Lifecycle
Data Warehousing Concepts What is Data Warehouse OLTP vs OLAP : Difference What is dimensional modeling What is star schema What is snowflake schema What is slowly changing dimension SCD Type 1 SCD...
View ArticleUnderstanding Datamart in Datawarehousing context
Data mart can be viewed as subset of Enterprise Data warehouse specially targeted towards Business Process or subject area. The difference in Data Warehouse and Data Marts is like that of planning a...
View ArticleData Warehousing Architecture & Components
Since we know what is data warehouse and its benefits its time to dig deeper to understand typical architecture of data warehouse and its architecture. Following diagram depicts different components of...
View ArticleUnderstanding Role Playing Dimension in Data Warehouse
Same dimension which plays different role to the fact is called as role playing dimension. Its generally implemented using views in dimensional modeling. e.g. Suppose there are two date entities in...
View ArticleUnderstanding OLAP and Type of OLAP
Online analytical processing is the capability to store and manage data in such a way the it can be used to generate actionable information which can be useful in decision making. As per BI...
View ArticleFast changing dimension and how to handle it in data warehouse system
A dimensions is said to fast changing or rapidly changing dimensions if one or more of its attributes changes very fast and in many rows. e.g. Consider a Employee dimensions where there are 1000 rows...
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