Chapter I: Networking & Web Fundamentals
Caching
Storing a subset of data in fast memory to speed up retrieval and reduce load.
In short
A cache stores a subset of data in fast memory so repeated reads avoid the slower underlying store.
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Key takeaways
- Write-through = consistent; write-back = fast but risky.
- LRU and LFU are the most common eviction policies.
- Never use a cache as a permanent, durable store.