Lesson 1755 of 2116
AI for Coding: Plan a Zero-Downtime Database Migration
Use AI to enumerate the expand-migrate-contract steps for a schema change and stress-test your plan against rollback scenarios.
Lesson map
What this lesson covers
Learning path
The main moves in order
- 1The premise
- 2expand-contract
- 3online migration
- 4backfill
Concept cluster
Terms to connect while reading
Section 1
The premise
Online schema changes follow well-known patterns, but every codebase has surprises; AI can produce a complete step list and rollback matrix faster than you can from memory.
What AI does well here
- Lay out expand, backfill, dual-write, cutover, contract phases
- List every code path that reads or writes the affected column
- Generate rollback steps for each phase
- Estimate backfill duration from row counts
What AI cannot do
- Run the migration against your production database
- Predict lock contention without your real workload
- Replace a staging dry run on a copy of production data
Key terms in this lesson
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