ACID, CAP, and Cache Field Guide
Recall the core differences among transaction guarantees, partition tradeoffs, and cache freshness.
What does ACID protect? A transaction-sized unit of truth: all-or-nothing changes, valid states, safe isolation, and durable commits. Use it when a business fact spans several database writes. ACID consistency versus CAP consistency Same word, different mechanism. Always name the failure mode. If we cache it, can the cache be the source of truth? A stakeholder wants faster reads for account status. Your line The database remains truth. The cache needs a TTL or invalidation rule, and high-risk decisions should bypass stale copies. Do not promise freshness from a cache without a measurable stale window. It accepts the speed goal…
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