The Art of CTO Database Migration Risk Assessor evaluates migration risks and generates strategies for database platform changes, schema migrations, and data transformation projects.
Frequently Asked Questions
What are the biggest risks in database migration?
The top risks are data loss or corruption during transfer, application downtime exceeding business tolerance, performance degradation from schema or query incompatibilities, and hidden dependencies on database-specific features (stored procedures, triggers, data types). Many migrations also underestimate the effort of migrating application code that uses database-specific SQL syntax. Thorough testing with production-volume data and a validated rollback plan are the most effective risk mitigations.
How do you plan a zero-downtime database migration?
Zero-downtime migration typically uses a dual-write pattern: first replicate data to the new database using change data capture (CDC), then modify the application to write to both databases simultaneously, verify data consistency, switch reads to the new database, and finally stop writes to the old one. This approach requires careful handling of schema differences, sequence/ID generation, and transaction semantics. Budget 2-4x more time for zero-downtime migrations compared to planned-downtime approaches.