DATABASES-EXPLAINED5 MIN READ
The Cache Is Not the Database
Explain when cache-aside is appropriate and how invalidation, TTL, and source-of-truth rules protect correctness.
Rina R Risk lead F Freshness H Harm P Policy The conflict 20 sec Speed versus freshness The account limits page is slow, but suspended accounts must stop transacting within 60 seconds. A cache design without a freshness contract can quietly violate risk policy. 30m requested TTL 60s suspension window
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