How to solve the cache degradation problem (Redis responds in 1 second, DB in 10ms)?

If Redis responds slower than the database, it indicates cache degradation, which reduces its efficiency. Possible solutions:

• Check Redis load and configuration: Redis might be overloaded or misconfigured.
• Vertical or horizontal scaling of Redis: add resources or cluster it.
• Optimize cached data: reduce size or update frequency.
• Use local cache in the application: for example, MemoryCache for frequently requested data.
• Profile queries: cache might be used inefficiently, and logic should be reviewed.

Example of using local cache in C#:

MemoryCache cache = MemoryCache.Default;
string key = "user_123";
var user = cache.Get(key) as User;
if (user == null)
{
    user = db.GetUser(123); // slow query
    cache.Set(key, user, DateTimeOffset.Now.AddMinutes(5));
}
return user;

Thus, by combining cache levels and optimizing Redis, you can achieve performance higher than that of the database.