If your system suffers from a database crash and you have enabled the differential or incremental backup jobs, you must follow a different procedure to recover your database.
 | CAUTION! Ensure that you always have a complete backup before you enable any differential or incremental backups. |
To recover from a complete and differential backup
Perform a recovery using the data from each of these backups in the following order:
The most recent complete backup
The most recent differential backup
The log backup after the crash
To recover from a complete, differential, and incremental backup
Perform a recovery using the data from each of these backups in the following order:
The most recent complete backup
The most recent differential backup
Ordered log backup (from earliest to latest) after the differential backup
Log backup after crash