Enabling Concurrency Scaling in Amazon Redshift WLM
A company uses an Amazon Redshift cluster that runs on RA3 nodes. The company wants to scale read and write capacity to meet demand. A data engineer needs to identify a solution that will turn on concurrency scaling. Which solution will meet this requirement?
Community Votes
100% of anonymous learners picked answer B. Votes are pick records left by other test-takers — they are not the verified answer.
Community Insight
Concurrency scaling is enabled at the WLM queue level within a provisioned Redshift cluster, not via global cluster creation settings or serverless workgroups.
This guide explains how to enable concurrency scaling for Amazon Redshift clusters by configuring the Workload Management (WLM) queue settings. It clarifies that concurrency scaling is a specific feature for provisioned clusters, distinct from the auto-scaling of Redshift Serverless.
Learners often confuse this with general cluster scaling or assume it applies to Redshift Serverless, which scales automatically without explicit concurrency scaling configuration.
Community Discussion (7 comments)
Comments & Corrections
No comments yet — spotted an error or have a note? Share it below.
Expert Analysis
Why the Answer Is Correct
Concurrent scaling in Amazon Redshift allows you to add temporary compute capacity to handle spikes in query load. This feature is configured specifically at the Workload Management (WLM) queue level. By enabling it on a queue, you direct queries exceeding the main cluster's capacity to be routed to the concurrency-scaling cluster. This granular control ensures that only specific types of workloads trigger additional costs.Why the Other Options Are Wrong
Option A is incorrect because Redshift Serverless automatically manages its own scaling and does not use the traditional WLM queue-based concurrency scaling model. Option C is misleading; while settings exist during creation, the functional activation happens per-queue, not as a blanket cluster setting. Option D refers to usage quotas, which are billing limits, not technical configurations for adding compute resources.Community Comment Notes
The community unanimously agrees on Option B. As noted by user TonyStark0122, "Concurrency scaling... is enabled through Workload Management (WLM) at the queue level." User San_Juan also confirmed that Redshift Serverless scales automatically, making Option A invalid for this specific requirement.Official Reference
Exam Strategy
When asked about 'concurrency scaling' in Redshift, always look for the WLM queue option. Remember that Serverless handles scaling differently and does not require manual concurrency scaling setup.
Frequently Asked Questions
Why can't I enable concurrency scaling globally for the whole cluster?
Concurrency scaling is controlled per WLM queue to allow selective routing of queries based on priority and type, optimizing cost and performance.
Does Redshift Serverless need concurrency scaling enabled?
No, Redshift Serverless automatically scales compute resources based on demand and does not support the traditional WLM-based concurrency scaling feature.
Related Analysis
Practice All DEA-C01 Questions
Access 100 questions with complete answers and detailed explanations.
View Full DEA-C01 Practice Test →