Concurrency scaling with Redshift Serverless

With Redshift Serverless there is no Concurrency Scaling charges as you see with Redshift Provisioned. In Redshift Serverless you do not provision nodes. Instead you start with Base RPU, which is Redshift Processing Units. You can go as high as 512 RPU's. Redshift Serverless handles the provisioning and scaling of compute for you. The serverless instance can scale higher from the Base RPU to accommodate more workloads as they come in automatically up to the usage limit you specify in Max RPU's. If you are at maximum RPU's then Redshift will queue up user queries for execution.