To Cache or Not To Cache - ASP.NET

I've recently implemented caching on some pages of my website. But it seems that caching won't help much because it is hosted on a shared server. While the page will be optimized using the cache, it can also be a reason to hit a 503 very soon, especially if caching is implemented with varying parameters.


But when should we use caching? I think caching can only solve scenarios to lessen the delay of serving resources to client browsers, instead of having a direct query to resources per request.

For example, I need to display data from database that takes about 1-2 minute query. This data can just be cached to have it served right away. But also, we should keep in mind that, if we put this on cache, we are putting these on memory..... and these memory takes a portion of the application pool's resource.

So, it is important to consider what to cache, and if the server (app pool) can cache.