AplusDBA

https://eng.uber.com/postgres-to-mysql-migration/

Why Uber Engineering Switched from Postgres to MySQL Uber Engineering explains the technical reasoning behind its switch in database technologies, from Postgres to MySQL.

http://datacenterfrontier.com/google-building-four-story-data-centers/

Scaling Up: Google Building Four-Story Data Centers The explosive growth of cloud computing has prompted Google to go vertical with its server farms and build four-story data centers.