Atlas › 15 SQL & Database Testing › Migration Testing☰ Read as one page
Migration Testing
5.1OverviewSchema migrations are one of the riskiest deployment operations. A bad migration can cause data loss, corruption, or extended downtime…5.2What Makes Migrations Risky5.3Migration Testing Checklist5.4Testing Migrations with Scripts5.5Testing Migrations in Python5.6Performance ConsiderationsAdding an index to a table with millions of rows can lock the table for minutes:5.7Migration Testing in CI5.8Practical Exercise1. Take a migration file (or write one that adds a new column) 2. Write a script that tests: applies cleanly, preserves data, rollback…5.9Key Takeaways- Migrations are high-risk operations — always test on a production schema copy - Test the full lifecycle: apply, verify, rollback, verify…