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The primary function of a cache is to increase data retrieval performance by reducing the need to access the storage in the backend.
Caches take advantage of the locality of reference principle thatย "recently requested data is likely to be requested again".
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A cache hit describes the situation where content is successfully served from the cache. The tags are searched in the memory rapidly, and when the data is found and read, it's considered a cache hit.
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A cache miss refers to the instance when the memory is searched, and the data isn't found. When this happens, the content is transferred and written into the cache.
๐๐ฎ๐ฐ๐ต๐ฒ ๐ถ๐ป๐๐ฎ๐น๐ถ๐ฑ๐ฎ๐๐ถ๐ผ๐ป is a process where the computer system declares the cache entries as invalid, as a result it removes the caches or replaces them. If the data in the system is changed, the cache should be invalidated. If this is not done, it can cause inconsistent application behaviour.
In our next post, we will go deeper into Caching and discuss write-through caching, write-around caching, write-back caching, eviction policies, distributed caching and more!
To read more on Caching, check out our blog on blog.coderco.io