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Write Through vs Write Back Cache | Cache Write Policies Explained | COA#computerorganization

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If cache is faster than databases… then why don’t we just use cache everywhere? This is one of those questions most developers never really think about. In real systems, cache is used for speed — but it’s not reliable enough to store actual data. Cache is temporary (data can be lost) Data can become outdated (stale) Memory is limited That’s why databases are still the source of truth, and cache is used as a performance layer on top. Understanding this difference is important if you want to move