JBoss 3.2.6 does this as well. If you play around with clustered indexes you 
can make it go away, however JBoss does access the DB in a non-optimal way (at 
least from SQL Servers perspective). I've been meaning to fix this (or at least 
supply a working XML file for SQL server) but dont have the time right now. 
Dont know if its documented but if you are using 3.2.6 or 4.0, or 4.0.1 (and 
probably 3.2.5) I highly sugest not using SQL server for JMS persistance.

The longer term answer is to profile and look at how JBoss creates, selects and 
deletes message with regards to tx_id's. We've seen jboss delete all messages 
with a tx_id while its still trying  to insert them. However thats from SQL's 
perspective and since we moved to a different JMS setup we no longer see these 
issues and only saw them while under load. 

Funny thing is you can reproduce this with even the singleton JMS if you pump 
thousands of  small messages through.

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