Improving Rails Migrations Using bulk: true - Mintbit

When working with Rails migrations, performance isn’t usually the first thing that comes to mind—until your schema starts getting big or you’re deploying changes to production environments with large databases. Fortunately, Rails provides a simple way to optimize schema changes: the bulk: true option. What is bulk: true in Rails Migrations? Introduced in Rails 5.2, the bulk: true flag can be passed to methods like change_table or create_table to group multiple schema changes into a single SQL statement, when supported by your database. This approach reduces the number of separate ALTER TABLE calls, which not only improves performance but can also prevent potential locking or downtime issues in large tables.