Even Fast Queries Can Crash Your Database
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Request cancellation prevents retry storms that can crash databases during performance issues. When queries slow down, users reload pages, creating duplicate requests that queue up and worsen the problem. Implementing cancellation tokens in ASP.NET Core endpoints and passing them through to database libraries like EF Core and Dapper allows the system to discard canceled requests before they reach the database. This works even for fast queries because the issue isn't query speed but what happens when the database experiences problems. The implementation is straightforward: add CancellationToken parameters to endpoints and pass them to all async database operations.