Comments on: Understanding Caching in Hibernate – Part Three : The Second Level Cache http://blog.dynatrace.com/2009/03/24/understanding-caching-in-hibernate-part-three-the-second-level-cache/ dynaTrace Blog on Performance, Scalabilty and Architecture - Java and .NET Application Performance Management Thu, 02 Sep 2010 08:57:48 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: Milt Sparks http://blog.dynatrace.com/2009/03/24/understanding-caching-in-hibernate-part-three-the-second-level-cache/comment-page-1/#comment-16131 Milt Sparks Thu, 03 Jun 2010 13:51:47 +0000 http://blog.dynatrace.com/?p=368#comment-16131 I've been looking all day for a solution to this very problem. Very well crafted and explained. Thanks for the in-depth info. I’ve been looking all day for a solution to this very problem. Very well crafted and explained. Thanks for the in-depth info.

]]> By: William http://blog.dynatrace.com/2009/03/24/understanding-caching-in-hibernate-part-three-the-second-level-cache/comment-page-1/#comment-13972 William Mon, 29 Mar 2010 06:08:31 +0000 http://blog.dynatrace.com/?p=368#comment-13972 i agreed that “Hibernate’s second level cache is completely worthless” seems to be a bit harsh. There is no doubt that cache is the ultimate way to overcome problems like performance, reliability and scalability. it is dream of each and every developer to have such an app which is free from above mentioned hurdles. i'll also second Mark about NCache. I've used NCache once and I believe it is a reliable source. i agreed that “Hibernate’s second level cache is completely worthless” seems to be a bit harsh. There is no doubt that cache is the ultimate way to overcome problems like performance, reliability and scalability. it is dream of each and every developer to have such an app which is free from above mentioned hurdles. i’ll also second Mark about NCache. I’ve used NCache once and I believe it is a reliable source.

]]> By: Mark http://blog.dynatrace.com/2009/03/24/understanding-caching-in-hibernate-part-three-the-second-level-cache/comment-page-1/#comment-11475 Mark Sat, 30 Jan 2010 10:49:53 +0000 http://blog.dynatrace.com/?p=368#comment-11475 Yeah Peter, it is not fair to say that second level caching is useless. Nhibernate’s second level cache is a great way to improve performance and scalability in my opinion. I have used a free distributed cache called NCache Express with Nhibernate with great success. You can see for yourself: http://www.alachisoft.com/ncache/ncache_express.html Yeah Peter, it is not fair to say that second level caching is useless. Nhibernate’s second level cache is a great way to improve performance and scalability in my opinion. I have used a free distributed cache called NCache Express with Nhibernate with great success. You can see for yourself: http://www.alachisoft.com/ncache/ncache_express.html

]]> By: Gulino Barnes http://blog.dynatrace.com/2009/03/24/understanding-caching-in-hibernate-part-three-the-second-level-cache/comment-page-1/#comment-8932 Gulino Barnes Wed, 25 Nov 2009 11:09:35 +0000 http://blog.dynatrace.com/?p=368#comment-8932 Great Information! Thanks for sharing! Great Information! Thanks for sharing!

]]> By: Whatty http://blog.dynatrace.com/2009/03/24/understanding-caching-in-hibernate-part-three-the-second-level-cache/comment-page-1/#comment-6351 Whatty Fri, 25 Sep 2009 23:21:14 +0000 http://blog.dynatrace.com/?p=368#comment-6351 I would agree that the comment about caching strategies posted on TSS is completely off based (and more specifically just plain wrong). In particular I read a whitepaper several years ago about the four different classifications of data (transaction, reference, static, last one can't remember) but if you look at these classifications of data it is fairly obvious that a good caching scheme can provide great benefits to the application layer in any n-tiered application infrastructure. Typically you want to avoid as much processing, network latency and overall response time in developing a highly performant application, avoiding work where ever possible being the goal. A well implemented caching strategy even just for reference and static data can provide significant benefit to the overall responsiveness of an application, particularly as you push the cache up the application layers closer and closer to the UI / Presentation layer (why build UI objects for every request - web app of course - when the data almost never changes). Having said that, one item that you kind of glossed over in the discussion of the Second level caches when referring to sessions is the concept of a web session and whether how this "session" corresponds to the traditional concept of a web "session". It was not immediately transparent to the novice reader whether or not these session coincided and if an object (static object) read from one session would be available as a cacheable entity in other web "sessions". We have found that caching of the static data and a nice pre-loading of that static data for all web sessions is a nice performance boost that is easily understood and lacking any of the caching issues read-write caching since the data does not change. Thanks for the articles. I would agree that the comment about caching strategies posted on TSS is completely off based (and more specifically just plain wrong). In particular I read a whitepaper several years ago about the four different classifications of data (transaction, reference, static, last one can’t remember) but if you look at these classifications of data it is fairly obvious that a good caching scheme can provide great benefits to the application layer in any n-tiered application infrastructure. Typically you want to avoid as much processing, network latency and overall response time in developing a highly performant application, avoiding work where ever possible being the goal. A well implemented caching strategy even just for reference and static data can provide significant benefit to the overall responsiveness of an application, particularly as you push the cache up the application layers closer and closer to the UI / Presentation layer (why build UI objects for every request – web app of course – when the data almost never changes).

Having said that, one item that you kind of glossed over in the discussion of the Second level caches when referring to sessions is the concept of a web session and whether how this “session” corresponds to the traditional concept of a web “session”. It was not immediately transparent to the novice reader whether or not these session coincided and if an object (static object) read from one session would be available as a cacheable entity in other web “sessions”. We have found that caching of the static data and a nice pre-loading of that static data for all web sessions is a nice performance boost that is easily understood and lacking any of the caching issues read-write caching since the data does not change.

Thanks for the articles.

]]> By: maike http://blog.dynatrace.com/2009/03/24/understanding-caching-in-hibernate-part-three-the-second-level-cache/comment-page-1/#comment-5901 maike Thu, 27 Aug 2009 08:18:32 +0000 http://blog.dynatrace.com/?p=368#comment-5901 Hey Peter, can you tell me What you use monitoring hibernate running tools Hey Peter, can you tell me What you use monitoring hibernate running tools

]]> By: Hibernate Stuff… « Java Vibes.. http://blog.dynatrace.com/2009/03/24/understanding-caching-in-hibernate-part-three-the-second-level-cache/comment-page-1/#comment-5768 Hibernate Stuff… « Java Vibes.. Wed, 19 Aug 2009 11:41:51 +0000 http://blog.dynatrace.com/?p=368#comment-5768 [...] Hibernate II level caching: http://www.javalobby.org/java/forums/t48846.html , http://blog.dynatrace.com/2009/03/24/understanding-caching-in-hibernate-part-three-the-second-level-... [...] [...] Hibernate II level caching: http://www.javalobby.org/java/forums/t48846.html , http://blog.dynatrace.com/2009/03/24/understanding-caching-in-hibernate-part-three-the-second-level-... [...]

]]> By: Ridcully http://blog.dynatrace.com/2009/03/24/understanding-caching-in-hibernate-part-three-the-second-level-cache/comment-page-1/#comment-5730 Ridcully Tue, 18 Aug 2009 09:52:03 +0000 http://blog.dynatrace.com/?p=368#comment-5730 Thanks for the article and especially for your answer to Dino's question. I had the same problem. Thanks for the article and especially for your answer to Dino’s question. I had the same problem.

]]> By: Alois Reitbauer http://blog.dynatrace.com/2009/03/24/understanding-caching-in-hibernate-part-three-the-second-level-cache/comment-page-1/#comment-5668 Alois Reitbauer Thu, 13 Aug 2009 08:09:13 +0000 http://blog.dynatrace.com/?p=368#comment-5668 I will post the source code shortly. Just have to massage it a bit to make it compile for you guys :-) I will post the source code shortly. Just have to massage it a bit to make it compile for you guys :-)

]]> By: Hibernate och 2:nd level cache på JBoss 4 - codemonkey http://blog.dynatrace.com/2009/03/24/understanding-caching-in-hibernate-part-three-the-second-level-cache/comment-page-1/#comment-5440 Hibernate och 2:nd level cache på JBoss 4 - codemonkey Thu, 23 Jul 2009 18:48:36 +0000 http://blog.dynatrace.com/?p=368#comment-5440 [...] som jag jobbar med om dagarna. Det finns en hel del att läsa om det hela (devx, dynatrace blog [...] [...] som jag jobbar med om dagarna. Det finns en hel del att läsa om det hela (devx, dynatrace blog [...]

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