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Could u please explain the DWH testing concepts

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IN DATA AREHOUSING CONCEPS ARE U KNOW MORE ABOUT THE FACT TABLE,DIMENSION TABLE AND DIFFERENT SCHEMAS LIKE STAR,SNOWFLAKE.

Hi ,

ETL or Data warehouse testing is categorized into four different engagements irrespective of technology or ETL tools used:

New Data Warehouse Testing – New DW is built and verified from scratch. Data input is taken from customer requirements and different data sources and new data warehouse is build and verified with the help of ETL tools.
Migration Testing – In this type of project customer will have an existing DW and ETL performing the job but they are looking to bag new tool in order to improve efficiency.
Change Request – In this type of project new data is added from different sources to an existing DW. Also, there might be a condition where customer needs to change their existing business rule or they might integrate the new rule.
Report Testing – Report are the end result of any Data Warehouse and the basic propose for which DW is build. Report must be tested by validating layout, data in the report and calculation.

ETL Testing Techniques:

1) Verify that data is transformed correctly according to various business requirements and rules.
2) Make sure that all projected data is loaded into the data warehouse without any data loss and truncation.
3) Make sure that ETL application appropriately rejects, replaces with default values and reports invalid data.
4) Make sure that data is loaded in data warehouse within prescribed and expected time frames to confirm improved performance and scalability.

Apart from these 4 main ETL testing methods other testing methods like integration testing and user acceptance testing is also carried out to make sure everything is smooth and reliable.

For more detailed info please refer the following URL-

http://www.softwaretestinghelp.com/etl-testing-data-warehouse-testing/

Thanks and regards

Amit : Infocepts PVT LTD.

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