Off-line/on-line backup

Kronodoc data can be backed up both off-line and on-line.

To perform an off-line backup, shut down Kronodoc and Oracle during the backup. This ensures data consistency to the highest level while making the system unavailable during the backup.

Making an on-line backup of both the database and the file system requires that the database has an on-line backup capability. Oracle database has this capability, which can be utilized if the backup system in use can use the Oracle on-line backup facilities. For more information on backup systems, see Oracle documentation and recommendations for backups, or e.g. Unix Backup & Recovery.

On-line backup may result in some inconsistency modes after recovery. The scope of the inconsistency depends on the timing of the backup, i.e. how many users were performing operations on Kronodoc when the on-line backup was made. These inconsistencies can and should be repaired manually, but may caused the loss of the inflicted data. It is advised to use file system snapshots, if available, to maintain as much consistency as possible.

If a user is adding a file into Kronodoc during backup, it is possible that:

• The file is saved and visible in Kronodoc Kronodoc.
• The file is lost and not visible in Kronodoc Kronodoc.
• The file is stored but not visible in Kronodoc Kronodoc. If a user tries to add a file with same name later, Kronodoc gives an error message and does not overwrite the file.
• The file is lost but remains visible in Kronodoc Kronodoc. When a user tries to access the file, Kronodoc gives an error message.

If a user is deleting a file during the backup, it is possible that:

• The file is deleted normally.
• The file is not deleted in backup.
• The file remains stored in Kronodoc but is not visible. If a user tries to add a file with same name later, Kronodoc gives an error message and does not overwrite the file.
• The file is deleted but remains visible in Kronodoc Kronodoc. When a user tries to access the file, Kronodoc gives an error message.