What is Hibernate Actually Doing? : Explained
Hibernate is doing a lot more than just writing SQL. In this video we pull back the curtain on how Hibernate actually works — from the moment an entity enters the Session, through dirty checking, flush scheduling, lifecycle states, and the second-level cache, all the way to the N+1 query problem and how to fix it.
In this video:
• What the Hibernate Session actually manages and why it acts as a Unit of Work
• The first-level cache and the identity map that guarantees one object per row
• How dirty checking automatically detects changes without explicit update calls
• Flush mechanics: AUTO, COMMIT, and MANUAL, plus why SELECT queries can trigger writes
• The entity lifecycle: Transient, Persistent, Detached, and Removed
• The second-level cache, shared caching, and concurrency strategies
• The query cache — when it improves performance and when it becomes a liability
• Lazy loading, proxy objects, the N+1 query problem, and how `JOIN FETCH` solves it
No ORM magic. No mysterious SQL. Just the mechanics behind how Hibernate actually manages your data.
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