// Fast: Fetches only what you need, immutable, no persistence context overhead List<PostDTO> posts = entityManager.createQuery("select new com.dto.PostDTO(p.id, p.title) from Post p", PostDTO.class).getResultList(); Why is this faster than the book's PDF suggests? Because you remove the Entity Manager from the equation. No snapshots. No comparisons. Just data transfer. Vlad Mihalcea’s book is fantastic, but the concepts evolve faster than print. If you search for a static PDF, you freeze your knowledge in time.
You are looking for the "secret sauce." You want the Vlad Mihalcea bible in a free, draggable format. high-performance java persistence book pdf
Most developers do this:
Stop searching for the file. Start searching for your slowest query. The book is just the map; the database is the real treasure. Did you find this helpful? If you are looking for legal resources, consider purchasing the ebook via Gumroad or checking out Vlad Mihalcea's free blog series—which contains 80% of the book's value, updated monthly. // Fast: Fetches only what you need, immutable,
But the truly interesting performance hack involves . No comparisons
The high-performance secret? Instead of updating item.current_price , you append a bid to a separate bid_history table and calculate the price on the fly via a materialized view. You bypass the lock entirely.