Introduction
Extract/Transform/Load is a process that extracts the data from source systems, transforms the information into a consistent data type, then loads all the data into a single depository. Moreover, it refers to the process of verifying, validating, and qualifying data while preventing data loss and duplicate records. In recent years, the demand for ETL testing has increased rapidly. Thus, you can join a certified ETL Testing Training Institute in Noida to get high-quality training for this course. It also confirms that this process itself is running smoothly and that there are no congestions. However, it is a multi-level, data-centric process. It can be helpful when setting up a data warehouse for the first time. It is also helpful after adding a new source of data to the existing data warehouse. Further, it is a multi-level, data-centric process.
What are the Stages of the ETL Testing Process?
ETL testing detects the problems with the data source before loaded into the data warehouse. As well as, the inconsistency in the business rules is done on purpose to guide the data integration and transformation.
It can be divided into eight stages
- Identify business requirements: – Design a data model, define the business flow, and assess the reporting needs that are based on the client’s expectations. It’s necessary to initiate here so the scope of the project is clearly documented, defined, and understood fully by the testers.
- Validating the data source: – Perform multiple records for the primary source table, so that you can, later on, verify that all the data was moved.
- Design test cases: – Think about testing the data on the targeted system for quality and completeness. Moreover, testing the performance of the ETL process is also a good idea. It is also important to validate the mapping document, to ensure that it contains all the information.
- Begin the ETL process with the extraction: – Extract the data from source systems and execute the testing as per the business requirements. Identify the types of bugs or defects experienced during the testing and make a report.
- Carry out the necessary data transformation: – At this stage, confirm that the data has been transformed to the suitable format for the target system and that it acts in accordance with the business norms.
- Load the data into the target warehouse: -Run SQL queries for each row, check the record count and confirm that all the data has been moved. Verify that you reject the invalid data and accept the values and data is transformed correctly according to the business rules.
- Document your findings: – Verify the options, layout, filters, and export the functionality of the summary report. Document any bug that you detect during the testing.
- Test closure: – Conclude testing and proceed with ETL.
When do we Need ETL Testing?
ETL testing can be helpful in increasing the productivity of IT professionals and simplifying the process of recovering big data to gain insights. Moreover, the following are some points that clarify the need for ETL testing: –
- While setting up the data warehouse for the first time after loading the data.
- ETL Testing is needed after adding a new source of data to the existing data warehouse.
- It is needed after the data migration project.
- While moving the data for any reason.
- After the data integration project.
- If there are issues with the quality of data in any of the target systems or the source systems.
- In case, if there are issues regarding the performance of ETL processes.
Conclusion
The stated information visibly highlights that ETL is a legit process that the data engineers use to extract data from multiple sources. ETL holds a lot of importance as it genuinely offers professionals some exceptional benefits. As technology is growing, the demand for skilled IT professionals is also increasing. In current years, ETL Testing has seen a rapid growth in its demand. Thus, you can join a ETL Testing Training Institute in Gurgaon and get a high-quality training in this field. Moreover, getting this certificate from an institute will make you eligible to acquire a good position in this field.
