A database that automatically scales up and down based on demand and charges you only for the compute time you actually use, with no server management required. Like a pay-per-minute parking meter instead of renting a monthly parking space — you only pay when your car is there.
A seasonal e-commerce site uses Amazon Aurora Serverless to handle their Black Friday traffic spikes automatically — the database scales from 2 to 64 capacity units during peak hours, then scales back down to near-zero overnight, saving 70% compared to always-on databases.
AWS Aurora Serverless v2 and Azure SQL Database serverless provide on-demand, auto-scaling database compute with usage-based billing. OCI Autonomous Database offers automated operations and auto-scaling, but it is typically provisioned with a baseline and scales within configured limits. GCP does not offer a direct, general-purpose relational database with true serverless compute scaling to zero; Cloud SQL can automate storage growth and some operational tasks, but compute is instance-based.