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In-Doubt Distributed Transactions

edited Mar 16, 2013 4:19AM in Database Administration (MOSC) 2 commentsAnswered
 Please help me in such situation
Regullary on my db i have In-Doubt Distributed Transactions with status "collection". 
I successfully clear them using "dbms_transaction.purge_lost_db_entry". At first I tried to wait until they were resolved by RECO process, as Oracle says:"The RECO background process of an Oracle instance automatically resolves failures involving distributed transactions". But in my case, I have entry in dba_2pc_pending with in-doubt transaction with fail_time more than month ago. Then why it wasn't resolved? 

But more intresting to me is, in what way I can find  what operation causes In-Doubt Distributed Transactions

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