How Teradata Retrieves a ROW?

How Teradata retrieves a row?

                                             

For example, a user runs a query looking for information on Employee ID 100. The PE sees that the Primary Index Value EMP is used in the SQL WHERE clause.

Because this is a Primary Index access operation, the PE knows this is a one AMP operation. The PE hashes 100 and the Row Hash points to a bucket in the Hash Map that represents AMP X. AMP X  is sent a message to get the Row Hash and make sure it’s EMP 100.