This starts a roll forward of the given log.  The log may have been
    produced by normal transaction logging, backup or crash dump.  Logs
    may not be transferred between databases and thus cannot be rolled forward
    anywhere except on the database that generated them.This function is for example useful after restoring a backup.
    It should be called for each archived transaction log produced since the
    backup, including and starting with the one that was current when the
    backup was made.The operation blocks until the roll forward is complete.
    Other clients are not affected.