PostgreSQL with Foreign Data Wrappers
PostgreSQL with Foreign Data Wrappers is a popular free database system that can reach out and work with data stored in many other places without copying it first.
PostgreSQL lets you run normal database queries that pull information from files sitting in cloud storage as if they were regular database tables. It uses Diskspace object storage by treating S3 buckets like a giant filing cabinet that it can open on demand to read spreadsheets, logs, or other files directly.
This means companies can analyze huge amounts of data kept cheaply in Diskspace without the expense and hassle of loading everything into the database. The real-world value is that you get powerful data insights while only paying for simple storage and avoiding slow data movement steps.