Collecting Performance Measurements and Metrics CT-PT Practice Questions (Page 3)

Questions 11–15

1. 11expert · hard

   A team is testing a database-heavy application. The test objective is to find the maximum throughput before response time degrades beyond 3 seconds. The team has collected response time and throughput data. Which metric is most important to collect and analyze to determine the 'knee' of the performance curve?

   • APeak response time at the highest load step
   • BThroughput at each load step, plotted against the corresponding average response time
   • CAverage CPU utilization on the database server
   • DTotal number of errors at the end of the test
   Reveal Solution Discussion Select an answer first
2. 12foundation · easy

   Why is 'resource utilization' an important performance metric to monitor during a load test?

   • AIt measures the number of users the system can support simultaneously.
   • BIt indicates how much of a system's capacity (e.g., CPU, memory) is being consumed, helping to identify bottlenecks.
   • CIt determines the percentage of failed transactions during a test.
   • DIt measures the time it takes for a system to respond to a request.
   Reveal Solution Discussion Select an answer first
4. 13application · medium

   A team is performance testing a batch processing system that runs nightly. The system processes a fixed number of records. The business is concerned about how long the entire batch takes to complete. Which metric is the most direct measure of the business concern?

   • AError rate of the batch job
   • BAverage response time of individual database queries within the batch
   • CElapsed time (wall-clock time) from batch start to batch completion
   • DPeak CPU utilization on the batch server
   Reveal Solution Discussion Select an answer first
5. 14expert · hard

   A test team is running a soak test (long-duration test) to detect memory leaks. They are collecting memory utilization data every 5 minutes. After 8 hours, the data shows a gradual increase in memory usage. To confirm a memory leak, what is the most appropriate next step in data collection and analysis?

   • AContinue the test and collect memory data at a higher frequency (e.g., every 30 seconds) to see if the trend continues and accelerates
   • BIgnore the memory data and focus only on response time metrics
   • CReduce the load to see if memory usage decreases
   • DStop the test immediately and declare a memory leak based on the 8-hour trend
   Reveal Solution Discussion Select an answer first
6. 15expert · hard

   A team is performance testing a real-time chat application. The business has two competing requirements: (1) messages must be delivered to the recipient's device within 200ms, and (2) the server must support 100,000 concurrent connections. The team has limited monitoring resources and must choose a primary metric for the test. Which metric best balances the need to validate both requirements?

   • AThroughput, measured as messages delivered per second
   • BResponse time, measured as the 99th percentile of message delivery time
   • CResource utilization, measured as CPU and memory on the chat server
   • DError rate, measured as the percentage of messages that fail to deliver
   Reveal Solution Discussion Select an answer first