問題文
A retailer must perform a one-time migration of historical customer records from a legacy system into the commerce and service platforms. The architect must choose a migration approach. What guidance is soundest?
選択肢
- Re-key each historical record by hand into each product, since manually typing millions of legacy customer records one at a time into each target system is the most reliable way to guarantee a correct one-time migration here.
- Migrate everything into the marketing platform only, regardless of which system ought to own each record, so the send tool holds the only copy of the historical customers and commerce and service begin with an empty table.
- Skip mapping and load the raw legacy structure unchanged, ignoring each product's model, so the legacy column names arrive in each target as they stood and the fields that fail to line up are left for somebody to interpret.
- Use standard bulk data-loading tools appropriate to each target, map the source fields to each product's model, and validate the loaded data, sequencing the load so identity is reconciled and records land in the correct system of record.