Ideally the hit ratio of secondary memory is considered as :

The hit ratio of secondary memory is ideally considered as 1. The hit ratio is a measure of the effectiveness of a cache or memory system. It is defined as the ratio Given the options: - 0: This would imply no hits at all, which is not ideal. - 1: This would imply every access is a hit, which is ideal for performance. - 0.5: This would imply half of the accesses are hits, which is better than 0 but not ideal. - 2: A hit ratio cannot be greater than 1 because it is a ratio of hits to total accesses. So The ideal hit ratio for secondary memory, or any cache/memory system, would be 1, indicating that every access results in a hit, maximizing efficiency and performance.