Performance issues are rarely the fault of Hibernate itself; more often, they are caused by its misuse. The key to success is identifying these issues before they manifest in production.

How to Find Problems Before Production

Performance issues are barely visible on a small test database with a single user, but they manifest catastrophically on real data under load. Therefore, you must start by configuring diagnostics.

1. SQL and Hibernate Statistics Logging

Enable SQL query and statistics logging to see exactly what Hibernate is sending to the database.

# Show SQL in logs (in dev environment) spring.jpa.show-sql = true spring.jpa.properties.hibernate.format_sql = true

# Collect detailed statistics (number of queries, execution time) hibernate.generate_statistics = true logging.level.org.hibernate.stat = DEBUG

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Statistics will show the total number of queries, their execution time, and the most crucial metric — the number of JDBC calls per session.

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