advancedJPA vs. Raw JDBC — Performance & When to Drop Down
Why is dropping to raw JDBC preemptively, without measuring, usually the wrong move?
The actual bottleneck in a slow query is far more often a missing index or an N+1 pattern than JPA's entity-hydration overhead — raw JDBC doesn't automatically fix either of those, so rewriting for performance without first measuring risks adding real complexity for a problem that might not have existed, or might not have been the JPA layer at all.
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