ETL Testing

ETL Testing

Data is of utmost importance in digital systems. Protecting data, therefore, is of utmost importance. ETL refers to Extract, Transform, and Load. It supports the movement of data from its source to storage. With ETL testing we ensure that the data is not lost or corrupted during this movement.

Huge volumes of data are collected in various formats and sources. The mapping process of these data is error-prone and can have quality issues.

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Verifying the consistency of the application data.

We at Precise Testing Solution make sure that the data is consistent during migration and in the data warehouse. The errors often located in ETL testing are invalid data values in source, data that do not conform to mapping rules, inconsistent formats between source and destination databases. We also find issues in performance

Ensure that the data is consistent during migration and We will do all type of testing to verify data migration is completed successfully. For this we will do pre and post migration testing and we will do testing for some random data set to check accuracy.
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We perform the following types of testing under ETL

We check for the following –

  • Duplicate data – We verify that there is no duplicate data.
  • Validating data as per rules – We validate that the fields meet the rules.
  • Metadata testing -We validate the source and target table structure.
  • Reference testing – We check the data against a set of attributes.

We can do this using two approaches –

  • Whitebox transformation testing : Here the transformation logic and mapping design are verified.
  • Blackbox transformation testing : The functionality of the system is verified.

We verify the application in an environment that is close to the production environment.