How to do bulk insert / bulk update / bulk delete (outside EF Core’s out-of-box, maybe with third party)?

Short answer: Use libraries like EFCore.BulkExtensions, Z.EntityFramework.Extensions. These provide optimized bulk operations, bypassing EF change tracking for performance.

Real-world example (ShopNest)

ShopNest’s order service uses EF Core to save an Order and its line items in one SaveChangesAsync() call inside a transaction.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.