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when someone visits my webpage I have about 100 requests to C# cache. Do you think I would be better off just getting the information from the database? because if I make a database call it is just one round trip to the database. But If I try to call this information from cache I have to make many round trips to the cache.
In-memory caches exist because a request to memory is nearly always quicker than a network request. Once you have the data in a cache, the only reason for re-querying the database is if you believe the data in your cache is out of date.
That said, if you are querying your cache many times, I don’t see how this could this be reduced to a single database query (unless you are obtaining data from your cache by row or field.)
Regardless, multiple trips to memory should still be far quicker than refreshing from the database.