The Cache Aside Pattern is a caching strategy where the application first requests data from Redis; if Redis has it (cache hit), it returns instantly, but if not (cache miss), the app retrieves data from MySQL and saves a copy in Redis for future requests. This pattern is ideal for data that is read frequently but changes infrequently, such as user login information.
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What is the Cache Aside PatternAdded:
So, how does this actually work? Well, the most popular way is a pattern called cache aside. It's pretty simple. First, your app asks Redis for the data it needs. If Redis has it, that's a cache hit. It gets sent back instantly. Job done. If Redis doesn't have it, a cache miss, no problem. The app just goes and asks MySQL, gets the data, and before it sends it to the user, it saves a copy in Redis for the next time someone asks.
And what kind of stuff is perfect for this? Pretty much anything that gets read a lot, but doesn't change every second. Think about user login information.
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