AWS Database Migration Service
User Guide (Version API Version 2016-01-01)

Data Validation Task Settings

You can 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. For more information on data validation, see Validating AWS DMS Tasks.

Data validation settings include the following:

  • To enable data validation, set the EnableValidation setting to true.

  • To adjust the number of execution threads that AWS DMS uses during validation, set the ThreadCount value. The default value for ThreadCount is 5. If you set ThreadCount to a higher number, AWS DMS will be able to complete the validation faster—however, it will also execute more simultaneous queries, consuming more resources on the source and the target.

For example, the following JSON enables data validation:

"ValidationSettings": { "EnableValidation": true, "ThreadCount": 5 }

For an Oracle endpoint, AWS DMS uses DBMS_CRYPTO to validate BLOBs. If your Oracle endpoint uses BLOBs, then you must grant the execute permission on dbms_crypto to the user account that is used to access the Oracle endpoint. You can do this by running the following statement:

grant execute on sys.dbms_crypto to <dms_endpoint_user>;