APR signature database management

APR signature database is a resource library of character string signatures for application recognition. To meet the changing requirements for application recognition, you must update the APR signature database in a timely manner and roll back the APR signature database as needed.

You can update the APR signature database by using one of the following methods:

• Automatic update.

  The device automatically downloads the most up-to-date APR signature file to update its local signature database periodically.

• Triggered update.

  The device downloads the most up-to-date APR signature file to update its local signature database immediately after you trigger the update operation.

• Manual update.

  Use this method when the device cannot obtain the APR signature file automatically.

  You must first download the most up-to-date APR signature file manually. The device then obtains the downloaded file to update its local signature database.

You can perform the rollback operation if high error rate or abnormality occurs when the device uses the current APR signature database for application recognition.

You can roll back the current APR signature database to the factory version or to the last version.