"zeravlai" wrote : | apart from the DataVersioningException with R_R, is there any other way that a transaction could abort under MVCC ?? | | Question is because wikipedia MVCC reference (which is pointed in the JBC document), talks about transactions aborting and restarting. Is there such a case with your implementation of MVCC ?? The wikipedia article is purely to explain the concept of MVCC. The details are, naturally, quite different in JBC when compared to a relational database. :-) Anyway, yes there are other reasons why a tx may fail, including timeout exceptions in acquiring locks, timeout exceptions in replicating calls to remote nodes (if using synchronous mode), any number of network/io exceptions, exceptions with a cache loader when writing state to a loader, out of memory exceptions, etc. Take your pick. :-) View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4224508#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...