Glossary term
What is Hit ratio? Meaning for developers
% of requests served by the cache. Example: 95% hit ratio → only 5% reach the database.
Learn it properly · System DesignLesson 15: Caching Part 1: Where to Cache and WhyWhy ask the database the same question 10,000 times a second? What caches are, why they work so well, every layer you can cache at — browser to buffer pool — what to cache, and how Redis and Memcached compare.