Delta Migration refers to the process of migrating only the changed or updated data from the old system to the new system after the initial data migration has been completed. This ensures that only the incremental changes (delta) since the first migration are transferred, reducing the data load and migration time.
Key Characteristics of Delta Migration :
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Focus on Changed Data
- Instead of migrating the entire dataset again, only new, modified, or deleted records are migrated.
- This is often done using tools that track data changes like Change Data Capture (CDC) or transaction logs.
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Use Case for Ongoing Migrations
- It’s particularly useful for real-time data synchronization between systems, ensuring that the target system stays up-to-date with the source system after the initial migration.
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Reduced Downtime
- Since only the latest changes are migrated, the overall migration window and downtime are minimized, which is critical for systems that require continuous availability.
