Databases

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YouTube Architecture YouTube Architecture Update 2: YouTube Reaches One Billion Views Per Day. That’s at least 11,574 views per second, 694,444 views per minute, and 41,666,667 views per hour. Update: YouTube: The Platform.
NoSQL at Netflix This is Yury Izrailevsky, Director of Cloud and Systems Infrastructure here at Netflix. As Netflix moved into the cloud, we needed to find the appropriate mechanisms to persist and query data within our highly distributed infrastructure. Our goal is to build fast, fault tolerant systems at Internet scale. We realized that in order to achieve this goal, we needed to move beyond the constraints of the traditional relational model. In the distributed world governed by Eric Brewer’s CAP theorem , high availability (a.k.a. better customer experience) usually trumps strong consistency. NoSQL at Netflix
memcached - a distributed memory object caching system

memcached - a distributed memory object caching system

What is Memcached? Free & open source, high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load. Memcached is an in-memory key-value store for small chunks of arbitrary data (strings, objects) from results of database calls, API calls, or page rendering. Memcached is simple yet powerful.
MangoDB

PostgreSQL

MySQL