Where is a good place to start to learn about custom caching in .Net
- by John
I'm looking to make some performance enhancements to our site, but I'm not sure exactly where to begin. We have some custom object caching, but I think that we can do better.
Our Business
We aggregate news stories on a news type of web site. We get approximately 500-1000 new stories per week. We have index pages that show various lists of the items and details pages that show the individual stories.
Our Current Use case: Getting an Individual Story
User makes a request
The Data Access Layer(DAL) checks to see if the item is in cache and if item is fresh (15 minutes).
If the item is not in cache or is not fresh, retrieve the item from SQL Server, save to cache and return to user.
Problems with this approach
The pull nature of caching means that users have to pay the waiting cost every time that the cache is refreshed. Once a story is published, it changes infrequently and I think that we should replace the pull model with something better.
My initial thoughts
My initial thought is that stories should ALL be stored locally in some type of dictionary. (Cache or is there another, better way?). If the story is not found, then make a trip to the database, update the local dictionary and send the item back.
Since there may be occasional updates to stories, this should be an entirely process from the user.
I watched a video by Brent Ozar, How StackOverflow Scales SQL Server, in which Brent states "the fastest database query is the one that you don't make".
Where do I start?
At this point, I don't know exactly what the solution is. Is it caching? Is there a better way of using local storage? Do I use a Dictionary, OrderedDictionary, List ? It seems daunting and I'm just looking for some good starting points to learn more about how to do this type of optimization.
