Pass the iSQI Performance Testing CTFL-PT_D Questions and answers with ExamsMirror

Dynamic and cloud-based systems introduce performance risks associated with virtualization due to the inherent nature of resource allocation and scalability in these environments. Virtualized systems often share physical resources, leading to potential contention and unpredictable performance impacts. These risks are more pronounced in dynamic/cloud-based architectures where resources are frequently allocated and deallocated based on demand, potentially causing latency, resource bottlenecks, and performance variability. ISTQB guidelines on performance testing emphasize understanding these risks to ensure reliable performance outcomes.

To calculate the minimum front-end processing capacity, we need to account for the peak and off-peak transactions:

Peak Transactions:

Assume 12 peak periods per hour.

During peak times, the transaction rate is 100 transactions/minute.

Off-Peak Transactions:

There are 60 - 12 = 48 minutes of off-peak periods per hour.

Off-peak transaction rate is 10.42 transactions/minute.

Total Transactions Per Hour:

Peak transactions: 12 * 100 = 1,200 transactions.

Off-peak transactions: 48 * 10.42 = 500.16 transactions.

Total transactions per hour: 1,200 + 500.16 = 1,700.16 transactions/hour.

Thus, the correct answer isD. 100 * 12 + (60 - 12) * 10.42 = 1,700.16 transactions/hour.

The characteristic risks associated with different architectures are as follows:

Dynamic/cloud-based systems: Critical workflows or dataflows to, from, or through unreliable or unpredictable remote servers, especially when such servers suffer periodic connection problems or intermittent periods of intense load. (C)

Client-server systems: Potential problems due to firewalls, packet inspection, and server load balancing. (A)

Multi-Tier systems: Failures related to the correct configuration of features such as distribution, virtualization, and scaling, during the initial configuration or subsequent updates. (D)

Distributed systems: Inadequate bandwidth or capacity on any individual server. (B)

References:

ISTQB Performance Testing Syllabus

ISTQB Glossary

When presenting to technical stakeholders, it is crucial to provide detailed information about the setup, preparation, and execution of the performance test.

Option Atalks about the test environment and passenger data logistics, which, while technical, is not as focused on the specific setup for the spike test.

Option Bdetails the specific environment setup by the systems manager and the preparation steps, which are highly relevant to technical stakeholders who will be involved in or overseeing the technical aspects of the test.

Option Cagain focuses on budget and timeline, not technical details.

Option Dis more high-level about the purpose of the test, which is not as relevant for technical stakeholders who need the specifics of the test setup.

Thus, Option B is the best fit as it provides the necessary technical details for the spike test environment and preparation steps.

When presenting performance test results, it is vital to compare the collected metrics against the predefined acceptance criteria and highlight areas needing improvement.

Option Aincorrectly suggests that no improvement is required for completed transactions, even though the acceptance value isn't met.

Option Brightly states that improvements are required for completed transactions but incorrectly suggests no improvement is needed for check-in transactions.

Option Csuggests no improvements are needed for either metric, which is incorrect as both are below the acceptance values.

Option Dcorrectly identifies that both the percentage of completed transactions and the check-in transactions are below the acceptance values and require improvement.

Therefore, Option D accurately reflects the need for improvements in both metrics to meet the acceptance criteria.

Endurance testing, also known as soak testing, evaluates the stability and performance of a system over an extended period under a significant load. This type of testing is designed to identify issuessuch as memory leaks, resource depletion, and other long-term stability problems that may not be evident in shorter testing durations. According to ISTQB guidelines, endurance testing is essential for ensuring that the system can maintain performance and stability over time, especially in operational contexts.

To calculate the number of departing passengers accessing the front-end only once to check in per hour, we follow these steps:

Total Departing Passengers in January:

465,000 passengers transported throughout January.

Duration of Operations in January:

Operating hours: 07:00 to 23:00, which equals 16 hours per day.

Total days in January: 31 days.

Total operating hours in January: 31 days * 16 hours/day = 496 hours.

Passengers Per Hour:

Total passengers: 465,000.

Total hours of operation: 496 hours.

Passengers per hour: 465,000 passengers / 496 hours = 937.5 passengers/hour.

Passengers Accessing Only Once for Check-In:

30% of departing passengers reconnect for a boarding pass, which means 70% access only once.

Passengers accessing only once: 70% of 937.5 passengers/hour = 0.70 * 937.5 = 656.25 passengers/hour.

Given the available options, the closest correct value isC. 625.00 departing passengers / hour.

Reproducibility is a fundamental principle of performance testing, ensuring that identical results are obtained when tests are repeated on an unchanged system. This principle is critical for verifying the reliability and consistency of performance test outcomes, allowing testers to confidently identify and address performance issues. ISTQB standards emphasize reproducibility to ensure that performance testing provides accurate and actionable insights.

The scope of performance testing is established during the test planning phase. During this phase, testers define the objectives, resources, schedule, and scope of the testing activities. This includes identifying the specific performance requirements, determining the test environment, and outlining the test strategy. According to ISTQB guidelines, effective test planning ensures that the performance testing efforts are aligned with the project goals and stakeholder expectations, setting a clear direction for subsequent testing activities.

The correct associations are based on the definitions of each type of performance testing:

Endurance testing: Focused on the stability of the system over a specific time frame. (B)

Scalability testing: Focused on the ability of a system to meet future efficiency requirements. (E)

Capacity testing: Used to determine the number of transactions a given system will support while still meeting established performance objectives. (A)

Stress testing: Evaluates a system's ability to handle reduced availability of resources. (D)

Concurrency testing: Focused on the impact of situations where specific actions occur simultaneously. (C)

References:

ISTQB Performance Testing Syllabus

ISTQB Glossary