How did you perform data migration and database update in your last project?

In my last project, data transfer and database updates were carried out in several stages:

1. Data analysis and preparation — checked the structure and quality of the source data, identified inconsistencies and duplicates.
2. Backup — created a backup of the current database before the update to allow rollback.
3. Migration scripts — wrote SQL scripts or used migration tools (such as Flyway or Liquibase) to modify the database schema and transfer data.
4. Batch data loading — for large volumes of data, used batch loading with JDBC batch or specialized utilities.
5. Testing — after transfer, checked data integrity and correctness, ran application tests.
6. Monitoring and optimization — monitored performance after the update, optimized queries and indexes if necessary.

This approach helped minimize system downtime and ensured data integrity during updates.