How to Decide on Migration?
Cost
The high cost of the currently used database system.
Support
The expected support not being/not able to be provided.
Cloud
Being able to use a cloud-based system.
Analyses
Compatibility
Migration Plan
Migration Test
Optimization
Go-Live
Migration Guide
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Feasibility and Analysis of Alternatives
During the migration phase, you must first analyze the database alternatives you are considering migrating to. After the analysis, you must consider the feasibility of the migration to the decided database(s). You should evaluate which database technologies are the right choice as a migration target for each of your database applications. Some applications using the database may have requirements that can be better met by other solutions. For this reason, you need to plan the choice you will make during the migration correctly.
Tip
If you are considering migrating a large number of applications, first, you should identify the applications you want to migrate and prepare a partial migration plan accordingly. The reason for this is not to risk your entire database cluster and to prepare your data integrity for migration in a planned manner. In cases where there are multiple applications, it would be wise to analyze the complexity of the migration process and prioritize them.
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Compatibility
Although a more comprehensive analysis of solutions to address potential compatibility issues will be conducted in later stages, it is also important to identify potential migration issues during the migration planning step.
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Migration Plan
When deciding which databases will be the subject of your migration plan, you should consider several factors. If it is your company's first database migration, you can start with an easier, lower-risk migration. The experience you gain will allow you to feel comfortable migrating your high-volume servers. If you are experienced with Oracle, you will see that you will easily adapt to PostgreSQL.
Paying enough attention to the planning process increases the chance of success and can reduce the number of unpleasant surprises later in the migration process.
If you do not feel secure enough, you can get a consultancy service from a professional company offering database management services.
After the application determines the order of priority, requirements such as performance, usability, management, and integration need to be determined.
You must design your database, platform, and high availability requirements in advance in order to plan both the migration process and the post-migration architecture.
Tip
During database migration operations, you must also consider the applications that use the database. In general, migration can be performed very easily for an in-house application or website for which you can modify the source code. A commercial software product developed by third parties that does not provide support for the database to be migrated may require additional developments, which can lead to a troublesome process during migration.
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Migration Test
Regardless of the scope of the migration process, it must be verified that the migrated application works as expected. At this point, certain tests need to be performed.
that the objects and data have been completely migrated to the target database and are consistent with the source database,
that the database and the application retain their previous functionality,
You must verify that the performance of the database and the application is acceptable.
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Post-Migration Optimization and Configuration
After the migration, it must be ensured that all necessary database extensions are installed and that the changes identified and verified during the testing phase are reflected in the production environment. It must also be remembered that if any changes were made to the source database during this process, these must also be reflected in the production environment. The system should be configured according to the recommendations derived from the performance test results performed in the test environment.
Tip
To prepare the system to run in the best possible way, database parameter adjustments and application connections will also need to be made. At this stage, it will also be advisable to test authentication methods, high availability, disaster recovery, and security requirements.
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Go-Live
At this stage, the following items must be implemented:
All objects and data that have been tested in the test environment and approved for migration to the production environment must be transferred to the production environment.
If the data is being fetched directly from the source database, the source database must be closed to writes at the moment of going live so that the new database can synchronize with the old one. At this point, downtime will be required. The required downtime may vary depending on the method used.
The system must be configured to use the migrated application with the new database. This configuration must be done after all operations on the old database are completed. In other words, there must be no incomplete or unfinished operations in the old database.
The go-live process will be completed once the production environment migration is opened for use in the completed environment.
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