[hibernate-issues] [Hibernate-JIRA] Resolved: (HHH-6614) Bad performance: audited entity updates (lots of them) with no EntityManager clear

Bad performance: audited entity updates (lots of them) with no EntityManager clear ---------------------------------------------------------------------------------- Key: HHH-6614 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6614 Project: Hibernate Core Issue Type: Bug Components: envers Affects Versions: 3.6.6 Environment: Hibernate 3.6.6, Oracle Reporter: Adriano Saturno Muniz Assignee: Lukasz Antoniak Fix For: 4.0.0.CR3 Attachments: src.zip I was testing Envers performance. I created an audited entity Mailmen, with a many-to-many relationship with another audited entyty, Address. Mailmen has a simple field called register. (and an Address collection, but lets simplify the code) I just created a new instance of Mailmen and edited it 100.000 times: configurationOverrides = new HashMap<String, String>(); emf = Persistence.createEntityManagerFactory("jpa", configurationOverrides); entityManager = emf.createEntityManager(); int MAX_EDITIONS = 1000000; carteiroDefault = new Mailman(); carteiroDefault.setRegister(64737); entityManager.persist(carteiroDefault); for(int i = 1; i <= MAX_EDITIONS; i++) { entityManager.getTransaction().begin(); carteiroDefault.setRegister(i); entityManager.getTransaction().commit(); } It tooks about 6 hours to run this code. It gets better or worse depending on MAX_EDITIONS, in a non linear way. Bad. But, if I change the for block to this: entityManager.getTransaction().begin(); entityManager.find(Mailman.class, carteiroDefault.getId()).setRegister(i); entityManager.getTransaction().commit(); entityManager.clear(); It tooks 30 minutes. It gets better or worse depending on MAX_EDITIONS, in a linear way. Much better. There's no bad performance without Envers in this scenario.