I have not analyzed all the JDBC code, but in line 398 in AsyncCacheLoader.java it says | int i = queue.drainTo(mods, config.getBatchSize()); | Let's assume our batch size is 100, and we have 9 transactions with 11 modifications each (sum=99 transactions) and another transaction with 4 modifications => sum=103 modifications. The code above would take the first 100 modifications, that is it would split the last transaction, and commit this to the DB. Please correct me if I am mistaken - as mentioned above, I have not read all the sources. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4211060#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...