MySQL and NoSQL: Help me to choose the right one

Question

There is a big database, 1,000,000,000 rows, called threads (these threads actually exist, I\'m not making things harder just because of I enjoy it). Threads has only a few

Answer 1

You should not be trying to fit a database architecture to hardware you're planning to buy, but instead plan to buy hardware to fit your database architecture.

Once you have enough RAM to keep the working set of indexes in memory, all your queries that can make use of indexes will be fast. Make sure your key buffer is set large enough to hold the indexes.

So if 12GB is not enough, don't use 10 servers with 12GB of RAM, use fewer with 32GB or 64GB of RAM.