(Doc) - 6.5. Offline sessions preloading

https://access.redhat.com/documentation/en-us/red_hat_single_sign-on/7.6/html/server_administration_guide/managing_user_sessions#offline-sessions-preloading

It is making reference to DG caches, which is obviously wrong and confusing. In fact, it is using  RH-SSO embedded caches.

The reference to DG caches should be removed as DG is not in used here.

The correct explanation is to indicate that it is using/relying on embedded caches.

6.5. Offline sessions preloading

In addition to RHDG caches, offline sessions are stored in a database which means they will be available even after server restart. By default, the offline sessions are not preloaded from the database into the RHDG caches during the server startup, because this approach has a drawback if there are many offline sessions to be preloaded. It can significantly slow down the server startup time. Therefore, the offline sessions are lazily fetched from the database by default.

However, Red Hat Single Sign-On can be configured to preload the offline sessions from the database into the RHDG caches during the server startup. It can be achieved by setting preloadOfflineSessionsFromDatabase property in the userSessions SPI to true.