Database recovery and oracle errors!!

Question

Hi, all.
I got the message that "Media Recovery is complete", but got some errors
when applying archive log files. I was able to open database.
I am just wondering why oracle gives us error message when applying archive
logs in the process of recovery(for instance, ora-00279,ora-00289,ora-00280,and
ora-00278)
Thanks in advance.
Best Regards.

Answer 1

How was the media recovery carried out? Manual recovery of database would result in those message (not errors).
[oracle@rhel4 ~]$ oerr ora 279
00279, 00000, "change %s generated at %s needed for thread %s"
// *Cause: The requested log is required to proceed with recovery.
// *Action:  Please supply the requested log with "ALTER DATABASE RECOVER
//           LOGFILE <file_name>" or cancel recovery with "ALTER DATABASE
//           RECOVER CANCEL".
[oracle@rhel4 ~]$ oerr ora 289
00289, 00000, "suggestion : %s"
// *Cause:  This message reports the next redo log filename that is needed,
//          according to the initialization parameters LOG_ARCHIVE_DEST and
//           LOG_ARCHIVE_FORMAT. This message assumes that LOG_ARCHIVE_DEST
//           and LOG_ARCHIVE_FORMAT are the same now as when the required redo
//          log file was archived.
// *Action: Consider using this filename for the next log needed for recovery.
[oracle@rhel4 ~]$ oerr ora 278
00278, 00000, "log file '%s' no longer needed for this recovery"
// *Cause:  The specified redo log file is no longer needed for the current
//          recovery.
// *Action: No action required. The archived redo log file may be removed
//          from its current location to conserve disk space, if needed.
//          However, the redo log file may still be required for another
//          recovery session in the future.