Explain cache hit and cache miss. What is cache hit ratio?

beginner

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Cache Hit: When requested data is found in the cache and can be served directly
Cache Miss: When requested data is not in the cache, requiring retrieval from the original source
Cache Hit Ratio: Percentage of requests served from cache vs total requests

Formula: Cache Hit Ratio = (Cache Hits / Total Requests) × 100

Example: If 80 out of 100 requests are served from cache, the hit ratio is 80%. Higher ratios indicate better cache effectiveness.

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