[jboss-user] [JCA/JBoss] - Re: Why JBoss is using XA if I only have local-tx datasource

[vickyk]

"maralcbr" wrote : 
  | My JBoss just have local-tx datasources configured. No XA datasources.
  | 
  | Why, in this scenario, JBoss still uses XA? There is a reason?
  | 
  | 
I am sure you don't understand the reason for the existence of local-tx-datasource , do you understand the reason behind it ?

local-tx-datasource are there to make the single one phase participant(db resource) to  enable in the JTA transaction , this is done by LRCO(last resource commit optimization) . Read this one 
http://wiki.jboss.org/wiki/Wiki.jsp?page=Multiple1PC

In case you are not using the global transaction (JTA) in your application code you can use no-tx-datasource.

And finally the TransactionManger is smart enough to just call only the commit when it finds that there is only one participant in the JTA transaction , it can omit the prepare phase ;)


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