| ERROR | data file is an old version - not accessing current version |
| CAUSE | The checkpoint in the file header is less recent than in the control file. If opening a database that is already open by another instance, or if another instance just brought this file online, the file accessed by this instance is probably a different version. Otherwise, a backup of the file probably was restored while the file was in use. |
| ACTION | Make the correct file available to the database. Then, either open the database, or execute ALTER SYSTEM CHECK DATAFILES. |
| 694155 | Error due to corrupt redo logs |