OGG-00657
Current online log {0} with sequence# {1,number,0} is STALE without alternative. Last read on RBA {2,number,0}, timestamp {3}, SCN {4,number,0}.{5,number,0}
Cause
Extract reached the end of an archive log on RAC, and the next log is not available. This can happen even though the other Extract threads are reading logs. This is by design to maintain transactional integrity. However, it is also possible that one of the RAC instances failed and is not generating archive logs. In this case, Extract stops.
Action
If all RAC instances are running correctly, no action is needed. Extract will continue when more data is available. If an instance fails and you can restore it, do so and then start Extract (if stopped). Parameters are available that enable Extract to continue processing if an instance fails (but with loss of data from that instance). For more information, contact Oracle Support.