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Cloud Computing · Advanced

Provisioned Concurrency

AWS Lambda feature that keeps a set number of execution environments initialized to respond with consistent low latency.

Definition

Provisioned concurrency pre-initializes environments so invocations avoid cold starts, billed for the configured amount whether used or not. It can be scaled with Application Auto Scaling on a schedule or utilization. Reserved concurrency, by contrast, caps and guarantees the maximum concurrent executions for a function.

Example

An API function keeps 50 provisioned concurrent environments during business hours to meet a 100 ms latency target.

Exam tip

Provisioned concurrency removes cold starts; reserved concurrency limits or guarantees capacity but does not pre-warm.

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