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- Redshift clusters earn up to one hour of free Concurrency Scaling credits per day. Credits are earned on an hourly basis for each active cluster in your AWS account, and can be consumed by the same cluster only after credits are earned. You can accumulate up to 30 hours of free Concurrency Scaling credits for each active cluster. Credits do not expire as long as your cluster is not terminated. [1]
- Concurrency Scaling clusters are added when a WLM slots are taken by running queries and other queries are waiting for a WLM slot to execute. You route queries to concurrency scaling clusters by enabling a workload manager (WLM) queue as a concurrency scaling queue. To turn on concurrency scaling for a queue, set the Concurrency Scaling mode value to auto. [2]
- Amazon Redshift automatically adds query processing power in seconds to process queries without any delays. [3]
[1] https://aws.amazon.com/redshift/pricing/#Concurrency_Scaling_pricing
[2] https://docs.aws.amazon.com/redshift/latest/dg/concurrency-scaling.html
[3] https://aws.amazon.com/redshift/features/concurrency-scaling/
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