You see this message when the Rollforward Recovery Utility has been invoked to perform a rollforward recovery. The Rollforward Recovery Utility has read the sequence numbers from the header of the files and also the last one that was written to the recovery log file. The sequence number in the headers and in the log file are the same indicating that the last updates written to the recovery log file have been applied to the files. It is therefore not necessary to perform a rollforward recovery as there are no updates in the recovery log file that have not already been applied to the files.
It is not necessary to perform the rollforward recovery.
See the sections Rollforward Recovery Logging and Rollforward Recovery Utility in the chapter Database Integrity for more details.