COURSE 22 OF 22
Data Migrations and Reconciliation
Compare old and new systems before switching readers to a new dataset.
Background reading
Introduction to Data Migrations and Reconciliation
A courier company replaces its delivery database. The migration copies the same number of rows, but one city’s charges are wrong. Matching row counts did not prove the records matched.
Reconciliation checks that two representations agree under a defined mapping. A migration needs key-level checks, business totals and a safe cutover—not only a copy job.
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