Transactional memory. Why bother memorizing something if you know how to access that information anytime when needed? I seem to recall Sherlock Holmes saying so

Transactional memory. Why bother memorizing something if you know how to access that information anytime when needed? I seem to recall Sherlock Holmes saying something about how he tried to forget everything that was unnecessary, so as to preserve his mental capacity for other things (ex. how when Homer learns something new he forgets something old).