Eager vs Explicit Loading
Design a small subsystem that relies on Eager vs Explicit Loading. Outline components, data flow, failure modes, and metrics.
Answers use simple, clear English.
Quick interview answer
Use Eager vs Explicit Loading as the core idea. Example shape: Order list with items: .Include(o => o.Items) prevents N+1 when rendering line counts..
Detailed answer
Use Eager vs Explicit Loading as the core idea. Example shape: Order list with items: .Include(o => o.Items) prevents N+1 when rendering line counts.. Watch for: Cartesian explosion with multiple Includes — use split queries.. Measure success via latency/error/saturation. Core: Include/ThenInclude eager-loads related data in one query. Explicit loading: reference/load after query. Avoid lazy loading in web apps (N+1 in loops). Real-time example: Order list with items: .Include(o => o.Items) prevents N+1 when rendering line counts. Pros: Include gives predictable SQL; projection Select reduces over-fetching. Cons: Cartesian explosion with multiple Includes — use split queries. Common mistakes: Lazy loading enabled globally causing hidden N+1 in foreach. Best practices: Prefer Select projection DTOs; AsSplitQuery for multiple collections. Audience level: Fresher.
Full explanation
Include/ThenInclude eager-loads related data in one query. Explicit loading: reference/load after query. Avoid lazy loading in web apps (N+1 in loops).
Real example & use case
Order list with items: .Include(o => o.Items) prevents N+1 when rendering line counts.
Pros & cons
Pros: Include gives predictable SQL; projection Select reduces over-fetching. Cons: Cartesian explosion with multiple Includes — use split queries.
Common mistakes
Lazy loading enabled globally causing hidden N+1 in foreach.
Best practices
Prefer Select projection DTOs; AsSplitQuery for multiple collections.
Follow-up questions
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