Solution : https://service.sap.com/sap/support/notes/581359 (SAP Service marketplace login required)
Key words :
terms rollback redo log amount greatly increased, alter system set fast_start_parallel_rollback = false, generated offline redo logs back, false index block split 8, oracle parameter fast_start_parallel_rollbackthe parameter, offline redo logs, index block splits, parameter immediately -, 4 cpu_count false, oracle bug 2186174
Related Notes :
584548 | Unusually high number of redo logs |