Spring Boot’s default Open Session in View (OSIV) keeps Hibernate sessions open throughout the request, silently triggering lazy‑loaded queries during JSON serialization, leading to N+1 problems and massive DB load under load, but disabling it and using explicit fetch joins restores performance.
The article explains what Open Session in View (OSIV) is, why keeping a Hibernate Session open for the whole request can silently cause massive N+1 query problems in Spring Boot REST APIs, and provides a concrete example and step‑by‑step solution using explicit fetch joins and disabling OSIV.
This article analyzes a severe N+1 query performance disaster in a Java Spring Boot project, explains why the traditional recursive approach is slow, and presents a production‑tested solution that reduces database calls to one, uses O(n) tree construction, and adds multi‑level caching to achieve a 100‑fold speedup.
This article explains why executing many small database queries in a short time harms performance, shows how to detect the N+1 problem with monitoring and logs, and presents refactoring techniques such as eager loading, batch operations, aggregation, caching, and hand‑crafted SQL to dramatically improve speed, scalability, and code quality.
This article explains the N+1 query performance issue, demonstrates a naïve Python/SQLite implementation that triggers N+1 queries, compares its runtime, and then shows how using SQL JOINs, GROUP BY, and nested data structures can dramatically improve query efficiency and reduce latency.
