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Learn ETL testing from best Institutes in Nagercoil. ETL is short for extract, transform, load, three database functions that are combined into one tool to pull data out of one database and place it into another database. ETL testing is done to ensure that the data that has been loaded from a source to the destination after business transformation is accurate. It also involves the verification of data at various middle stages that are being used between source and destination.

It is a process of how data is loaded from the source system to the data warehouse. Data is extracted from an OLTP database, transformed to match the data warehouse schema and loaded into the data warehouse database. Many data warehouses also incorporate data from non-OLTP systems such as text files, legacy systems and spreadsheets

ETL testing is performed in five stages
1. Identifying data sources and requirements
2. Data acquisition
3. Implement business logics and dimensional Modelling
4. Build and populate data
5. Build Reports
ETL systems commonly integrate data from multiple applications (systems), typically developed and supported by different vendors or hosted on separate computer hardware. The disparate systems containing the original data are frequently managed and operated by different employees.



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