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8.2 Eradicating the JPA N+1 Query Problem with EntityGraphs
Topic Summary
Diagnose N+1 query storms in logs and fix them with @EntityGraph, JOIN FETCH, and Hibernate batch fetching.
What You Will Learn
• Diagnose the N+1 problem (1 query for parents, N additional queries for lazy children).
• Use `@EntityGraph` for eager fetching without Cartesian product explosions.
• Configure `default_batch_fetch_size` for paginated queries.
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