I was surprised to read through this great description about SQL systems at large scale, and not see a single mention of cache. I searched for 'cache' on the pa

I was surprised to read through this great description about SQL systems at large scale, and not see a single mention of cache. I searched for 'cache' on the page to check I didn't miss something. SQL servers at this scale are so reliant on Memcache and other related solutions that it seems like a large omission.