FLASHBACK [DEVICE TYPE [=] deviceSpecifier [, deviceSpecifier]...] DATABASE { {TO SCN [=] integer | TO SEQUENCE [=] integer [THREAD [=] integer] | TO TIME [=] ' date_string '} | {TO BEFORE SCN [=] integer | TO BEFORE SEQUENCE [=] integer [THREAD [=] integer] | TO BEFORE TIME [=] ' date_string '}}