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Unfortunately, when dictionary from redo logs is used, the origin is much slower. This is not due to any of the code in the origin (there is no difference in logic as far as SDC is concerned), it is entirely within Oracle that it is slow. Oracle just takes much longer to return data when redo log dictionary is chosen. There is not a whole lot we can do.

Also, looking at your logs, you seem to be using an older SDC version. Not that it will make a huge difference, can you try SDC 3.4.3 in which we changed some of the logminer window logic?