| ERROR | media recovery requesting unknown archived log for thread string with sequence string and starting SCN of string |
| CAUSE | Media recovery is requesting a log whose existence is not recorded in the recovery catalog or control file. |
| ACTION | If a copy of the log is available, then add it to the recovery catalog and/or control file via a CATALOG command and then retry the RECOVER command. If not, then a point in time recovery up to the missing log is the only alternative and database can be opened using ALTER DATABASE OPEN RESETLOGS command. |