SSD

For many years the rotating monster (harddrive) has been one big thing of interest for the algorithms around database systems. Indexes where created to retrieve and access data faster from memory than from disc. With SSDs a faster persistent storage medium is being established. At first everything seems like that with a very fast read we would have to buy a high penalty for sequential write (something like 1:10 in terms of throughput). So you can actually different index structures and algorithms for SSDs and HDDs that work optimal on one hardware and suboptimal for the other. But over time product development will definitely remove the write penalty from SSDs. Not completly but quite significantly. So now what to do with a disc? What a bout another storage layer between RAM and HDD?