Execution - ETL Testing Process

ETL (Extract, Transform, Load) testing is an important part of data warehousing and data integration projects. It involves testing the complete process of extracting data from source systems, transforming the data into a format suitable for analysis, and loading the data into the target system. In this tutorial, we will cover the execution phase of ETL testing.

Getting Started with ETL Execution

Syntax:

The execution phase of ETL testing involves the following steps:

1. Creating test cases based on the ETL requirements.
2. Reviewing and approving the test cases.
3. Creating test data to be used in the testing process.
4. Executing the test cases on the ETL process to identify defects.
5. Analyzing the test results and logging defects in a defect tracking tool such as JIRA or Bugzilla.
6. Re-executing the test cases after fixing the identified defects to ensure that the fixes are effective.

Example:

Here's an example of a test case for the ETL execution phase:

Test Case: Data Validation

Objective: To ensure that the data from the source system is correctly transformed and loaded to the target system.

Steps:

1. Open the source system and verify that the data to be extracted is available.
2. Start the ETL process for the selected data set.
3. Verify that the data is correctly transformed according to the defined rules.
4. Verify that the data is correctly loaded to the target system.
5. Verify that the record count in the target system matches the record count in the source system.
6. Verify that all key fields have non-null or unique values as applicable.

Output:

The output of the ETL execution phase is a test report that contains details of the executed test cases, including any defects identified and their status.

Explanation:

The ETL execution phase involves executing the test cases created during the design phase to identify defects in the ETL process. The test cases cover a range of scenarios, including data validation, data transformation, data loading, and data reconciliation.

During the execution phase, it is important to ensure that the test data used in the testing process is appropriate and comprehensive. It should cover a range of scenarios and edge cases to ensure that the ETL process performs correctly under all situations.

Use

The purpose of the ETL execution phase is to identify defects in the ETL process before it is deployed in a production environment. By identifying and fixing these defects, it ensures that the ETL process performs optimally and reduces the risk of data corruption or data loss.

Important Points

• The ETL execution phase involves the execution of the created test cases to identify defects in the ETL process.
• It is important to ensure the test data used in the testing process is appropriate and comprehensive.
• A defect tracking tool should be used to log and track identified defects.

Summary

In this tutorial, we covered the ETL execution phase, including the syntax, example, output, explanation, use, and important points. The ETL execution phase is a critical part of ETL testing, as it ensures that the ETL process performs correctly and reduces the risks of data loss or corruption. To ensure that defects are identified and fixed in a timely manner, it is important to use an appropriate defect tracking tool and perform re-testing after fixing the identified defects.