Five advices on implementing a cache
I’ve spent the last few days at work implementing a cache in the data access layer (DAL) of one of our services. The cache works great, and speeds up our service very much in some cases, and somewhat in all cases. I’ve implemented caches before, and experienced many of the difficulties that arise when introducing a cache. It always seems rather easy, and always has unwanted side effects. The general advice is of course not to do it (and the advice from the database guys are always not to do it), but here are my five best advices on what you should consider if you decide to do it.
