Cachiranje pohranjuje često-pristupane podatke u brz sloj (često u memoriji) kako bi se mogli brzo dohvatiti bez ponovnog izračunavanja ili ponovnog dohvaćanja iz sporijih izvora. To je jedna od najvažnijih tehnika za poboljšanje performansi i skalabilnosti.
Što cachiranje čini
CACHING stores copies of data in a FAST location for quick repeated access:
→ instead of recomputing or re-fetching from a slow source (database, API, computation),
serve from the fast cache
→ DRAMATICALLY faster (cache hit) + REDUCES load on the slow backend
→ trades some staleness/complexity for big performance and scalability gains.
Gdje se cachiranje koristi (slojevi)
BROWSER / CLIENT cache → cache on the user's device
CDN → cache static content at edge locations near users
APPLICATION cache (e.g. Redis/Memcached) → cache DB query results, computed data, sessions
DATABASE cache → query/result caching
→ caching can happen at MULTIPLE layers (defense in depth for performance)
