Cause: A clone database open forces logfile renaming to avoid overwriting the primary logfiles Action Rename the logfiles manually or using the log_file_name_convert initialization parameter

Cause: The specified process did not start. Action: Ensure that the executable image is in the correct place with the correct protections, and that there is enough memory.

Cause: It has been detected that an online log that is being archived has been reused Action: Cannot archive the logfile anymore since it has been overwritten

Cause: The redo block indicated by the accompanying error, is not vaild. It has a checksum that does not match the block contents. Action: Do recovery with a good version of the log or do time based recovery up to the indicated time. If this happens when archiving, archiving of the problem log can be…

Cause: An attempt to switch the current log of a single thread is not allowed because the compatiblity requirements force a new log format version number. When changing log formats, all threads must switch to the new format at the same time. Action: Open the database to cause the coordinated log switch. If that is…

Cause: The file header for the redo log contains a checksum that does not match the value calculated from the file header as read from disk. This means the file header is corrupted Action: Find the correct file and try again.

Cause: An attempt to switch to a new online log for the redo thread failed because no reusable log could be found. This log is being cleared and will be useable when the clearing completes. The command that began the clearing may have terminated without completing the clearing. Action: If the clear command is still…

Cause: A request to drop a logfile member was denied because it would remove data required to form a complete logfile. Action: If desired, delete the entire log (after archiving if required), by using DROP LOGFILE;