![]() The general methodology of ETL testing is usually to use SQL scripting, which can time-consuming, error-prone and seldom provide complete test coverage. But it is expected that the future of this field will be more of an agile process in which data issues are fixed on the fly, and largely automatically, with no interruption to data ingestion. In the past, this was done in a waterfall approach by identifying problems in the data or the ETL process, building a system to resolve those problems, testing that everything works, and rolling into production. Finally, generating and analyzing reports that reflect the performance.ĮTL testing is about discovering problems in the data stream and correcting them. Then, building and populating general and targeted data. ![]() Followed by implementing business logics and dimensional Modelling. First one is identifying the data sources and requirements for the system in use.Second is performing an efficient and timely data acquisition. It also involves the verification of data at various middle stages that are being used between source and destination.ĮTL testing is performed in five stages. Many data warehouses also incorporate data from non-OLTP systems such as text files, legacy systems and spreadsheets.įor more info on ETL, check my other blog post regarding thisĮTL testing is done to ensure that the data that has been loaded from a source to the destination after business transformation is accurate. Data is extracted from an OLTP database, transformed to match the data warehouse schema and loaded into the data warehouse database. This process includes the performance of three tasks: Extracting the data, transforming the data, and then loading the data. ![]() ![]() Last, we will provide some best practices to be followed for optimal ETL testing.ĮTL is a process in data warehousing that is responsible for pulling data out of the source systems and placing it into a data warehouse. Moreover, we will discuss the relevance of ETL today, common users and use cases, and pros and cons. We will then define ETL testing, the process, how it works, and why it’s important. In this post we define ETL and discuss what does it mean exactly. ![]()
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