Recoverer Process (RECO)

The Distributed Transaction Recovery Process finds pending distributed transactions and resolves them. Pending distributed transactions are two-phase commit transactions involving multiple databases.The RECO process manager two-phase commits to track and resolve in-doubt transactions. The database that the  transaction started is normally the coordinator. It will send request to other  databases involved in two-phase commit if they are ready to commit. The RECO process of a node automatically connects to other databases involved in an in-doubt distributed transaction. When the RECO process reestablishes a connection between involved database servers, it automatically resolves all in-doubt transactions, removing from each database's pending transaction table any rows that correspond to the resolved in-doubt transactions.

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