The recoverer process (RECO) is a background process used with the distributed
database configuration that automatically resolves failures involving distributed
transactions. 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.
If the RECO process fails to connect with a remote server, RECO automatically tries to
connect again after a timed interval. However, RECO waits an increasing amount of
time (growing exponentially) before it attempts another connection. The RECO process
is present only if the instance permits distributed transactions. The number of
concurrent distributed transactions is not limited.
恢复进程
解决分布式事务的失败
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