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Validating AWS DMS Tasks: AWS DMS provides support for data validation, to ensure that your data was migrated accurately from the source to the target. If you enable it for a task, then AWS DMS begins comparing the source and target data immediately after a full load is performed for a table.
Data validation is optional. AWS DMS compares the source and target records, and reports any mismatches. In addition, for a CDC-enabled task, AWS DMS compares the incremental changes and reports any mismatches.
During data validation, AWS DMS compares each row in the source with its corresponding row at the target, and verifies that those rows contain the same data. To accomplish this, AWS DMS issues appropriate queries to retrieve the data. Note that these queries will consume additional resources at the source and the target, as well as additional network resources.
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