Data Warehouse testing involves comparing of large volumes of data typically millions of records. Data that needs to be compared can be in heterogeneous data sources such as databases, flat files etc. Data is often transformed which might require complex SQL queries for comparing the data.
What are the different types of testing in data warehouse?
- Unit Testing – This type of testing is being performed at the developer's end. ...
- Integration Testing – ...
- System Testing –
What is ETL data warehouse testing?
Extract, Transform, and Load (ETL) is the common process used to load data from source systems to the data warehouse. ... ETL testing ensures that the transformation of data from source to warehouse is accurate. It also involves verifying data at each point between the source and destination.
In which testing the whole data warehouse application is tested together?
In system testing, the whole data warehouse application is tested together. The purpose of system testing is to check whether the entire system works correctly together or not. System testing is performed by the testing team.
What do you test for in ETL testing?
What is ETL Testing? 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. ETL stands for Extract-Transform-Load.11 dic 2021
What are the five stages of ETL testing?
- Identifying data sources and requirements.
- Data acquisition.
- Implement business logic and Dimensional Modeling.
- Build and populate data.
- Build Reports.
What is difference between test plan and strategy?
Test plan can be defined as a document for a software project which defines the approach, scope, and intensity on the effort of software testing. The test strategy is a set of instructions or protocols which explain the test design and determine how the test should be performed.18 dic 2019
What are the types of testing in ETL?
ETL testing fits into four general categories: new system testing (data obtained from varied sources), migration testing (data transferred from source systems to data warehouse), change testing (new data added to data warehouse), and report testing (validate data, make calculations).
How do you do ETL Testing?
- Identify your business requirements. ...
- Assess your data sources. ...
- Create test cases. ...
- Begin the ETL process with the extraction. ...
- Perform the necessary data transformation. ...
- Load the data into the target destination. ...
- Document your findings.
What is ETL Testing Tool?
ETL testing is a multi-level, data-centric process. It uses complex SQL queries to access, extract, transform and load millions of records contained in various source systems into a target data warehouse.
What is ETL Testing for beginners?
ETL — Extract/Transform/Load — is a process that extracts data from source systems, transforms the information into a consistent data type, then loads the data into a single depository. ETL testing refers to the process of validating, verifying, and qualifying data while preventing duplicate records and data loss.