Varieties of Migration Testing:
This guide is the follow-up of our series on data migration testing.
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Conducting a data migration test is essential for safely transferring data between a legacy system and a new system with no data loss. Numerous variants of migration testing frequently take place in the field of IT.
In this guide, we will delve into the diverse types of migration testing commonly implemented.
What You Will Learn:
Types of Migration
The following are the varied types of migrations that occur regularly:
- Application Migration
- Database Migration
- Server Migration
- OS Migration
Concerning the approach, strategy, and testing stages for migration testing, they are the same as those we covered in Tutorial #1.
Apart from the migration testing scenarios discussed in Tutorial 1, we also need to carry out specific validations for each type of migration.
Here are the areas that need extra testing for each kind of migration:
#1) Application Migration
Application migration entails moving the whole application from one platform or environment to another.
Merits of application migration:
- Decreases operational and maintenance costs
- Lowers dependencies on other systems
- Eliminates or lessens business risks
- Boosts system performance
- Strengthens technical assistance and administration
- Offers additional functionalities and bug fixes
- Enables tech changes
Depiction of application migration:
Illustrations of application migration:
- Moving an application to the cloud platform
- Shifting an application from ASP to ASP.Net technology or ASP.Net to Windows Azure technology
Testing procedures:
- Analyzing requirements and pinpointing stable necessities
- Understanding the scope of testing
- Analyzing and testing all flows in the legacy application against the new application
- Testing new flows in the migrated application, if present
Test scenarios:
I) Upgraded Application:
- Confirm previous functionalities and enhanced features
- Test application with both existing and fresh data
II) Migration to new technology:
- Check the entire application for correct operation
- Ascertain compatibility of new technology with all components
- Test for congruency with operating systems and browser versions
- Confirm data retention and functionality in the new tech
#2) Database Migration
Database migration entails moving all the data in an application’s database to a different database.
Perks of database migration:
- Supports numerous databases to handle extensive customer data
- Allows for data enhancement
- Boosts data quality via analysis
- Cleans and samples data for a tidy and efficient database
- Fosters data analytics
Instances of database migration:
- Moving from one RDBMS to another RDBMS
- Transitioning from RDBMS to MongoDB
- Upgrading from Informix HC4 to HC6 or HC7
Testing activities:
- Make sure the legacy database is not updated during tests after migration
- Make sure there are no changes in field and table mapping
- Confirm accurate and comprehensive data migration
- Carry out pre-migration and post-migration testing
Test scenarios:
I) Migration to the same type of database:
- Ensure query results in the new database correspond with the old database
- Confirm the number of records is identical in both databases
- Confirm there’s no redundancy and match structure with old database
- Make sure changes in the application correctly update the new database
- Check compatibility with all components
- Test query performance
II) Migration to a different type of database:
- Test data handling for all fields
- Validate compatibility with the new database
#3) Server Migration
Server migration involves shifting server data from one server to another, along with migrating configurations.
Benefits of server migration:
- Enhanced configurations
- Better reliability
- Cleaner logs for analyzing request-response
- Improved performance
Example of server migration:
- Migrating from Windows to Mainframe server
- Transitioning from HP Box to IBM Box
Testing activities:
- Ensure compliance with the new server
- Test data handling
- Confirm directory names and file sharing
- Ensure no corruption of data
Test scenarios:
- Check request-response between the application and the server via APIs
- Analyze client-server logs
- Exam the entire system
- Ensure environment and connectivity stability
#4) OS Migration
OS migration involves transitioning an application from one operating system to another. Compatibility risks make it challenging.
Advantages of OS migration:
- Increased virtualization on a cloud-centered platform
- Reduced operational and maintenance costs
- Enhanced speed, support, productivity, and security
Illustrations of OS migration:
- Migrating from Windows to Linux
- Migrating from Windows to MAC
- Shifting to cloud-based Software as a Service (SaaS)
- Migrating to cloud-based virtual machines
Testing activities:
- Analyze dependencies in the new OS
- Understand and test the application considering configuration modifications
- Conduct comprehensive testing to affirm compatibility
Test scenarios:
- Validate hardware and software compatibility
- Ensure OS value does not influence application behavior
- Test application performance on the new OS
Conclusion
Grasping the type of migration and the specific aspects that need testing for each is pivotal for successful migration. By pinpointing and sorting out potential issues during testing, we can facilitate seamless migration.
Click here to read the first part of this guide.
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