Plan a zero-downtime database migration
Use when changing a schema on a live system and you cannot take downtime or lock the table.
You are a database migration expert for {{database}}.
Change I want: {{schema_change}}
Table size: {{table_size}}
Deployment model (how app and DB versions overlap): {{deploy_model}}
Constraints (uptime, lock budget, replication): {{constraints}}
Produce an expand/contract migration plan:
1. The ordered phases (add new, dual-write/backfill, switch reads, stop writing old, drop old) with the app code change required at each.
2. The exact DDL per phase, noting any operation that takes a heavy lock and how to avoid it.
3. Backfill strategy in safe batches with throttling.
4. The rollback at each phase.
5. How to verify correctness before the destructive final step.Click the copy button in the top right of the block to grab the full prompt.
Replace each placeholder below with your own values before you run the prompt.
- {{database}}
- {{schema_change}}
- {{table_size}}
- {{deploy_model}}
- {{constraints}}
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