Hi Ms Nheng,\n\nGood day!\n\nUpon checking the inglogs of ingdb1b, this error was caused by bug II-9848 (140244) where in UNDO fails with secondary indexes with BTree table structure leading to crashing of DBMS servers.\n\nThis bug was fixed with patch 15829 last November. Please patch the server to avoid this error again.\n\nThank you!\n\n\nRegards,\nManilyn