The method of reactivating online extensibility for a realm depends on what caused the error which resulted in the suspension of online extensibility.
If the relevant realm does not have to be dropped to clear the cause of the error, you can reactivate online extensibility for this realm in the current part of the session with the DAL command REACT INCR. This is the case, for instance, if additional disk storage space had to be made available under the user ID.
If the relevant realm has to be dropped to clear the cause of the error, online extensibility can only be reactivated once the cause of the error has been cleared, by re-attaching the realm. This is the case, for instance, if the secondary assignment of the realm file has to be reset from 0 to a value greater than 0. Online extensibility of a realm is also implicitly reactivated if the database had to be dropped and restarted to clear an error, or if the session had to be terminated and restarted.
With the DAL command DISPLAY INCR, you can query whether online extension has been suspended for a realm.