tl;dr:"So, without fully getting into the weeds on database-specific quirks, I will cover everything you should understand about RDBMS indexes. I will touch briefly on transactions and isolation levels and how they can impact your reasoning about specific transactions."
tl;dr:Redis is coined off of “Remote Dictionary Service”, and is an "open-source key-value database server. The most accurate description of Redis is that it's a data structure server." Mahdi highlights various deployments of Redis, their trade-offs and its internal architecture.
tl;dr:(1) The network is reliable, (2) Latency is zero, (3) Bandwidth is infinite, (4) The network is secure, (5) Topology doesn't change, (6) There is one administrator, (7) Transport cost is zero, (8) The network is homogeneous.