Cause: An add logfile member or drop logfile request specified a logfile group number that does not exist. Action: Check the configuration of the log files and reissue the command.

Cause: The log given to recovery is a backup of the online version from the time it was the current log. The archived version of the log would not be marked as end of thread. This error can also be caused by failing to list the current log of an enabled thread in a CREATE…

Cause: An add logfile or add logfile member command would result in a log with too many members. The number of members is set when the database is created. Action: Use fewer log file members.

Cause: An attempt has been made to remove the last member of a log file group. Action: If desired, delete the entire log, by using DROP LOGFILE.

Cause: A create or alter statement specified too many members in a parenthesised file list. Action: Specify a number of file members that is within the port-defined limit.

Cause: A filename was given to drop logfile member that is not a part of the database, or which is a data file. Action: Supply a valid logfile member name.

Cause: A change number found in the redo log is lower than a previously encountered change number. The log is corrupted in some way. The corruption may be at the earlier change or at this one. Action: Do recovery with a good version of the log or do time based recovery up to the indicated…

Cause: Some type of redo log corruption has been discovered. This error describes the location of the corruption. Accompanying errors describe the type of corruption. Action: Do recovery with a good version of the log or do incomplete recovery up to the indicated change or time.

Cause: An IO error has occurred while writing the log Action: Correct the cause of the error, and then restart the system. If the log is lost, apply media/incomplete recovery.

Cause: Check of log file header at database open found that an online log has log reset data that is different from the control file. The log is probably an incorrectly restored backup. Action: Restore correct file or reset logs.