OGG-02840
Failed to start transaction {0}.{1}.{2} (0x{3}.{4}.{5}) at {6} {7} due to conflict with tran start at {8} {9}, xid {10}.{11}.{12} (0x{13}.{14}.{15})
Cause
Found conflicts between transaction start position and tran log start position.
Action
Contact Oracle Support.