"zeravlai" wrote : Also Manik, in "mvcc-entity" predefined cache config, there's a comment saying that READ_COMMITTED is as strong as neccesary for most 2nd level cache use cases. What's the meaning of this sentence bearing in mind your reply ? R_C is (slightly) more efficient that R_R in our MVCC implementation. This is why I recommend it for Hibernate, since Hibernate provides R_R anyway through its first level cache. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4221205#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...