1Z0-1067-25 practice question 11 of 15

Recently, your e-commerce web application has been receiving significantly more traffic than usual. Users are reporting they often encounter a 503…

Recently, your e-commerce web application has been receiving significantly more traffic than usual. Users are reporting they often encounter a 503 Service Error when trying to access your site. Sometimes the site is very slow. You check your instance pool configuration to con-firm that the maximum number of instances is configured to allow 20 compute instances. Currently, 14 compute instances have been provisioned by the instance pool. You also confirm that current CPU utilization across all hosts exceeds the scale-out threshold you set in your auto-scaling policy. However, the instance pool is not provisioning any new instances. What can you check to determine why the application is NOT functioning properly? (Choose the best)

Answer options

A. Verify that the new offer feature code did not introduce any performance bugs.

B. Verify that the compute resource quota has not been exceeded.

Correct answer

C. Verify that the Quality Assurance team is not currently performing load-testing against production.

D. Verify that the database is accessible.

Correct Answer:

B. B. Verify that the compute resource quota has not been exceeded.

Explanation

The autoscaling policy is correctly triggered by high CPU utilization, but no new instances are being provisioned despite the instance pool's maximum size not being reached (14 out of 20). This indicates an external constraint is preventing the creation of new compute resources. A service limit or resource quota at the tenancy or compartment level is a common reason for this behavior. If the account has reached its limit for the specific compute shape or total OCPUs, the OCI platform will deny the provisioning request from the autoscaling service, causing the scaling action to fail.

Why Incorrect

A. A performance bug would explain the high CPU and slowness but not why the autoscaling mechanism itself fails to provision new, requested instances.
C. QA load-testing explains the cause of the high traffic and the need for scaling, but it does not explain the failure of the scaling action.
D. Database inaccessibility would likely cause application errors, but it would not prevent the compute autoscaling service from attempting to launch new instances based on its CPU metric.

References

1. Oracle Cloud Infrastructure Documentation, "Troubleshooting Autoscaling", Section: "The autoscaling action failed". It states: "The tenancy has reached the service limit for the shape that is specified in the instance configuration. To resolve, increase your service limits."

2. Oracle Cloud Infrastructure Documentation, "Service Limits", Section: "About Service Limits". This document explains that service limits are allowances set on resources, and requests to create resources beyond these limits will be rejected.

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