Amazon Redshift is based on PostgreSQL 1)
Redshift is also based on Paraccel (now called Actian Matrix)
Amazon Redshift Spectrum enables you to run Amazon Redshift SQL queries against exabytes of data in Amazon S3.
A single node cluster includes 200GB, with a max size of 2.56TB. Customers with fewer than 20 million monthly events should start with a single DC1 node cluster and add nodes as needed.