A mobile banking app's API shows high response times during a load test. The application server CPU is at 90%, and the database CPU is at 20%. The API endpoint uses a regular expression to parse and validate user input for every request. Which cause-to-failure-mode relationship is most accurate?

Configuration error causes slow response time

Inadequate hardware causes scalability issues

Inefficient algorithm causes high resource utilization

Concurrency issue causes high resource utilization

Certified Tester Performance Testing

Domain 1Objective 6

Common Performance Efficiency Failure Modes and Their Causes CT-PT Practice Questions (Page 3)

Part of the Basic Concepts domain, which makes up ~25% of our current practice bank. ISTQB does not publish an official question count, but from its 90-minute exam (~35–60 total, ~9–15 in this domain), expect 2–3 from this objective — we provide 12 practice questions to prepare you well beyond it. (estimate)

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Questions 11–12

11application · medium
A mobile banking app's API shows high response times during a load test. The application server CPU is at 90%, and the database CPU is at 20%. The API endpoint uses a regular expression to parse and validate user input for every request. Which cause-to-failure-mode relationship is most accurate?
Select an answer first
12application · medium
An online booking system's response time degrades sharply when the number of concurrent users exceeds 100. Monitoring shows the application server's thread pool is exhausted, and requests are queued. The database is idle. The application uses a single shared connection pool with a maximum size of 50. Which cause is most likely responsible?
Select an answer first

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Common Performance Efficiency Failure Modes and Their Causes CT-PT Practice Questions (Page 3)

Questions 11–12

A mobile banking app's API shows high response times during a load test. The application server CPU is at 90%, and the database CPU is at 20%. The API endpoint uses a regular expression to parse and validate user input for every request. Which cause-to-failure-mode relationship is most accurate?

Keep studying — Basic Concepts