Teradata Migration to Cloud

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The Teradata Database channel includes discussions around advanced Teradata features such as high-performance parallel database technology, the optimizer, mixed workload management solutions, and other related technologies.
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Teradata Migration to Cloud

What is the process of data migration from in-house Teradata servers to cloud platform?
Is there any specific tools required for the same?
Also , how do we calculate if the cloud migration will be costly or cheaper?