write « Cache « JPA Q&A

1. Does any JPA implementations support write-behind caching?    stackoverflow.com

Am I correct in saying Hibernate 3.6.5 does not support write-behind caching (implemented by EhCache 2.4.2)? Are there any other JPA compliant ORM that supports write-behind caching?

2. Hibernate 2nd level cache only write but not read    stackoverflow.com

I have the next two entities Person:

@Entity
@Table(name = "person")
public class PersonDTO implements Serializable {

    private static final long serialVersionUID = -3859029259805663330L;

    @Id
    @Column(name ...

3. Hibernate : SecondLevel Cache : Can't write to a readonly object    coderanch.com

4. Read-write cache - how to make it work?    forum.hibernate.org

Hi all, I'm trying to configure second level cache for an entity I'm using. Since the application may change data for this entity, I tought read-write cache is the appropriate mode. I'm using ehcache as the cache vendor. I added that to the hibernate.cfg.xml file: and supplied cache configuration file: When ...

5. Write-behind Cache Support - On the Roadmap?    forum.hibernate.org

Hi All, Is write-behind cache support planned at any point for Hibernate? I need to create a scoreboard system that could end up under heavy load - millions of rows, and a great deal of concurrency (although still 10:1 read:write ratio). I need to be able to post a score and store it's rank (so say a score of 1 million ...

6. Writing my own SecondLevel cache    forum.hibernate.org

7. Which JVM cache? What about nonstrict read/write caching?    forum.hibernate.org

My dev team is using Hibernate 2.1.4 and about to enable JVM caching (we're not using JTA) and have two principal questions: 1. Which cache provider should we use? We don't require clustering (yet) and so EHCache and OSCache are the most likely candidates... but I'm curious if anyone has any positive/negative experiences to share or if anyone can point me ...

8. 2nd level cache and copy on write into session possible?    forum.hibernate.org

I'm are considering using a very large 2nd level cache for a large app with many users. Since there are so many sessions and a large part of the DB would be in the 2nd level cache, it is a pity that each object used in a session is always copied. It would cause us to hit physical memory limit (30GB ...

9. Using second-level cache "read-write"    forum.hibernate.org

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10. Real write behind caching    forum.hibernate.org

Hibernate version: 3.0 What is the best way to implement seamless out-of-session write behind within a domain model and still use Hibernate? I know there is a session level write behind cache, but I feel this is not what I need. A few domain classes are updated so frequently, that it is not feasible to always issue an sql update in ...

11. "use of process level read-write cache is not recommend    forum.hibernate.org

I apologize for the basic question, but could someone please tell me what is meant by: "in JTA environment, use of process level read-write cache is not recommended" I am currently developing a web-based application using Tomcat, Struts and MySQL. I am planning to use ehcache with read-write caching strategy. Is it safe to do so? I can't use read-write strategy, ...

12. Read-write cache not reading external database modifications    forum.hibernate.org

Hibernate version: 2.1.8 Name and version of the database you are using: MySQL 4.1 Mapping documents: Code: ...

13. 2nd-level cache: read/write vs. nonstrict read/write    forum.hibernate.org

I am new to Hibernate and have a question regarding the 2nd-level cache feature. Environment: Hibernate 3.2CR2 with SQL Server 2005 I have a simple persistent class named Event, and I have enabled caching for it. Here is a code fragment that illustrates a load, followed by an update, then another load: Code: Session session = HibernateUtil.getSessionFactory().getCurrentSession(); session.beginTransaction(); Event anEvent = ...

14. Caching problem with read-write mode    forum.hibernate.org

//Open session & Start transaction TestObj o1 = (TestObj)hibernateSession.get(TestObj.class, 1); TestObj o2 = (TestObj)hibernateSession.get(TestObj.class, 2); TestObj o3 = (TestObj)hibernateSession.get(TestObj.class, 3); //Comit transaction & close transaction //a few moment latter (still the same SessionFactory) //Open session & Start transaction TestObj to1 = (TestObj)hibernateSession.get(TestObj.class, 1); TestObj to2 = (TestObj)hibernateSession.get(TestObj.class, 2); TestObj to3 = (TestObj)hibernateSession.get(TestObj.class, 3); //Comit transaction & close transaction

15. merge() successful in cache but not written to DB?    forum.hibernate.org

I'm new to Hibernate and am obviously missing something basic about the semantics of merge(). The examples in "Java Persistence with Hibernate" say that if you have a persistent instance in the cache and merge a transient instance into it, the updated state will be written to the database upon commit. In my case the merge appears to work in the ...

16. Write caching    forum.hibernate.org

17. Problem with read-write cache    forum.hibernate.org

I have a one-to-many relationship between Parent and Child tables. I have read-write caching (EHCache) and query caching enabled, and I have defined caching in both Parent.hbm.xml and Child.hbm.xml as well as the Child set in Parent.hbm.xml. Running queries works great and by following the output from show_sql I can see that the data gets cached ok and table reads are ...

18. Write-through Secondary Cache using EHCache?    forum.hibernate.org

Hey all, I searched around this forum, and also Googled, but I couldn't find anything related to enabling a write-through secondary cache using EHCache for Hibernate. Is that because it cannot do so? Search with Google led me to GigaSpaces caching system, and I'm wondering if I have to step away for EHCache if I want the write-through behavior. I tried ...

19. Write to 2nd Level Cache, but NOT DB    forum.hibernate.org

Is it possible to configure Hibernate to write to the second level cache, but not the database? CacheMode doesn't really have a value that pertains to this, but I was also thinking of writing an interceptor to change the cache behavior. Reason We currently receive messages from another system in which we consume and put in the database with Hibernate. We ...

20. Second Level Cache with Read-Only - attempt to write    forum.hibernate.org

Newbie Joined: Thu May 22, 2008 9:48 am Posts: 12 Supposedly I have this large amount of data that is definitional and drives the application. It should not change. Because of this, I thought it a good idea to enable an application-wide second level cache. I annotated all the the classes @Cache(READ_ONLY) that were in the hierarchy of these definitions. However, ...

21. write directly in tangosol cache    forum.hibernate.org

22. SecondLevel Cache : Can't write to a read only object    forum.hibernate.org

Hello, We are using EHCACHE as the second level caching mechanism in our Hibernate project. As part of EHCACHE configuration I want to cache certain associations. Thus in a hbm file I have added at the class level and also at the association level. Code: