migration-patterns

To safely add a NOT NULL column to a production database, you should add the column as nullable, backfill existing rows in batches, and then apply the constraint to avoid table locks and outages.

Renaming a column without downtime requires a multi-step pattern: add the new column, dual-write to both columns, backfill existing data, update application reads, and finally drop the old column.

Database migration patterns handle large table schema changes by using batched updates and tools like pt-online-schema-change to perform operations with minimal impact and avoid locking the production database.

Yes, you can use Prisma to apply safe, reversible, and atomic database migrations in production by following specific patterns for schema changes, constraint management, and data backfilling to minimize downtime risks.

To safely add a foreign key constraint to an existing table, you validate the data first, add the constraint in a separate migration step, and ensure the operation does not lock the table during production traffic.

Database migrations cause table locks and data corruption risks when schema changes like adding constraints or renaming columns are executed directly on large tables during active production traffic without batched or atomic patterns.