Success criteria are the measurable outcomes that demonstrate whether your data migration has achieved your expectations and objectives. For instance, some common success criteria include migrating the data within budget and timeline, validating and verifying the accuracy and completeness of the data, ensuring the data is compatible and consistent with the target system or format, making sure the data is accessible and usable by the intended users and applications, and minimizing the impact of the data migration on the source system or format.

To determine the success of your data migration, you need to conduct a thorough data migration test. Validate the accuracy of transferred data, ensuring completeness and integrity. Compare the migrated data with the original dataset, checking for any discrepancies. Additionally, involve stakeholders to review and provide feedback on the migrated data, ensuring its usability and functionality.