Scalability and Performance

Question 1

In system integration, what does the term ‘performance’ primarily focus on?

Answer 1

It relates to response qualities, such as processing speed and the number of requests handled per second.

Question 2

How is ‘scalability’ defined in the context of application health?

Answer 2

The system’s capacity to overcome performance restrictions by adding more hardware resources.

Question 3

Performance of an application is considered _____ because it changes based on load and system parameters.

Answer 3

dynamic

Question 4

Which performance metric measures the total time required to process a single request?

Answer 4

Response Time

Question 5

What performance metric tallies the number of requests or page impressions a program can process in a specific timeframe?

Answer 5

Throughput

Question 6

Why is ‘System Availability’ considered a critical baseline metric?

Answer 6

Other performance metrics cannot be measured if the system is offline.

Question 7

What is the formula for ‘System Availability’?

Answer 7

The ratio of uptime versus downtime.

Question 8

In resource-centric performance, what is compared against total throughput to assist with capacity planning?

Answer 8

The volume of resource requests.

Question 9

Why is understanding the frequency of requests for specific resources like CPU or memory necessary?

Answer 9

To enable full application scaling.

Question 10

How is the relationship between scalability and performance best understood in distributed cloud environments?

Answer 10

By analyzing resource consumption.

Question 11

What happens to performance as system load increases beyond a certain point?

Answer 11

Performance inevitably diminishes due to resource pressure.

Question 12

What is the outcome for an application that lacks scalability as load increases?

Answer 12

Performance continues to decline through longer response times or reduced throughput regardless of hardware.

Question 13

Define ‘Vertical Scaling’ (Scaling Up).

Answer 13

Adding more hardware resources, such as CPU or RAM, to an existing single node.

Question 14

What is the primary advantage of Vertical Scaling?

Answer 14

It requires no changes to the application architecture.

Question 15

What is the main limitation of Vertical Scaling?

Answer 15

Scalability is constrained by the maximum capacity of the individual hardware node.

Question 16

Define ‘Horizontal Scaling’ (Scaling Out).

Answer 16

Adding more nodes or computers to the system and distributing requests across them.

Question 17

Which scaling approach is recommended for cloud-based setups?

Answer 17

Horizontal Scaling.

Question 18

What is a major advantage of Horizontal Scaling beyond workload management?

Answer 18

It offers enhanced failover capacity and improved application availability.

Question 19

If hardware is not overutilized but performance remains poor, what is the likely cause?

Answer 19

A synchronization bottleneck.

Question 20

What trade-off do organizations make when adopting ‘eventual consistency’?

Answer 20

They sacrifice real-time data accuracy for higher throughput and better resource use.

Question 21

What role do load balancers play in integration architectures?

Answer 21

They spread incoming requests over numerous instances of integration components.

Question 22

Name three common load balancing strategies.

Answer 22

Round-robin, least connections, and session-based routing.

Question 23

How does message queuing facilitate system integration?

Answer 23

It decouples the sender and receiver systems to enable independent message processing.

Question 24

Apache Kafka and RabbitMQ are examples of _____.

Answer 24

Distributed Message Queues

Question 25

How does caching data improve the overall performance of a system?

Answer 25

It minimizes the need for expensive computations or resource-intensive database searches.

Question 26

What is the purpose of 'Data Replication' in a distributed system?

Answer 26

It ensures data is dispersed over numerous nodes to enable load balancing.

Question 27

Name an example of a distributed caching technology.

Answer 27

Redis (or Memcached).

Question 28

In cloud infrastructure, what is 'Elasticity'?

Answer 28

The ability to dynamically expand or contract resources based on current demand.

Question 29

What mechanism in cloud platforms like AWS or Azure automatically provisions resources in response to metrics?

Answer 29

Auto-scaling

Question 30

What is the purpose of 'Session Persistence' or 'Sticky Sessions'?

Answer 30

Ensuring successive requests from the same client are routed to the same instance to maintain session state.

Question 31

What is the specific goal of 'Load Testing' in integration architectures?

Answer 31

To discover performance bottlenecks by simulating high traffic scenarios and stress testing.

Question 32

What does 'Performance Tuning' entail for message processing or database queries?

Answer 32

Refining methods and execution plans to improve scalability and responsiveness.

Question 33

How does 'In-Memory Caching' reduce database load?

Answer 33

By storing frequently requested data in memory to avoid repetitive, resource-intensive queries.

Question 34

Which optimization technique focuses on indexing strategies and data modeling?

Answer 34

Database Optimization

Question 35

Where can API responses be cached to enhance response speeds?

Answer 35

At multiple layers, such as the gateway or individual services.

Question 36

What is the benefit of real-time performance monitoring solutions?

Answer 36

They provide insights into system behavior, resource consumption, and reaction times to pinpoint bottlenecks.

Question 37

What is the role of 'Event-Driven Architectures' (EDA) in microservices?

Answer 37

They enable communication between microservices to take place in a loosely connected manner through events.

Question 38

Define 'Event Partitioning'.

Answer 38

The separation of events into logical partitions to accomplish parallel processing and scalability.

Question 39

What is the advantage of 'Event Batching'?

Answer 39

It groups multiple events together to process them faster and with less administrative burden.

Question 40

How does 'Event Compression' improve system performance?

Answer 40

It minimizes the overall size of events to improve transmission and storage efficiency.

Question 41

Name a tool specifically used for load testing integration architectures.

Answer 41

Apache JMeter (or Gatling/LoadRunner).

Question 42

What is the objective of tuning query execution plans?

Answer 42

To increase query performance and reduce latency.

Question 43

How can performance optimization be integrated into the development pipeline?

Answer 43

By incorporating automated performance testing and profiling into continuous integration (CI) processes.

Question 44

What is the function of 'Performance Regression Monitoring'?

Answer 44

To assist in maintaining consistent performance as a system evolves and grows.

Question 45

In integration architecture, what does 'Least Connections' refer to?

Answer 45

A load balancing strategy that distributes requests to the node with the fewest active connections.

Question 46

What is the primary difference between a message queue and a standard direct request?

Answer 46

Message queues allow for asynchronous communication and decoupling.

Question 47

What is the relationship between hardware resources and 'Performance Decay'?

Answer 47

Performance inevitably diminishes as load increases because physical resources are finite.

Question 48

Which cloud-based metric is typically used to trigger auto-scaling?

Answer 48

Workload-related metrics (such as CPU utilization or request count).

Question 49

What is the purpose of 'Performance Profiling'?

Answer 49

To analyze system efficiency and locate specific areas causing performance degradation.

Question 50

How does 'Round-robin' routing distribute requests?

Answer 50

By cycling through the list of available nodes in a fixed, sequential order.

Question 51

Why is it important to maintain 'Session Affinity' in load balancing?

Answer 51

To preserve the integrity of session-related data for the client.

Question 52

What is the core benefit of using 'Amazon SQS' in an integration design?

Answer 52

It provides a scalable and error-tolerant messaging capability for asynchronous communication.

Question 53

How does 'Data Modeling' contribute to performance tuning?

Answer 53

By structuring data in a way that optimizes retrieval speed and storage efficiency.

Question 54

In an Event-Driven Architecture, what is the purpose of 'Consumers'?

Answer 54

To process the events that have been placed in logical partitions.

Question 55

What does 'deprovisioning' refer to in the context of cloud auto-scaling?

Answer 55

Automatically removing resources that are no longer needed due to decreased demand.

Question 56

What is the primary goal of optimizing 'Query Execution Plans'?

Answer 56

To reduce the time and resources the database requires to retrieve specific data.

Question 57

Why is 'throughput' often measured in 'requests per second'?

Answer 57

To provide a standard rate for assessing the volume of traffic a program can handle.

Question 58

What is the impact of 'Friction' as an analogy for system load?

Answer 58

It represents how increasing load eventually slows down system responsiveness.

Question 59

In horizontal scaling, how are incoming requests distributed across nodes?

Answer 59

Through load balancing strategies.

Question 60

What prevents 'Session State' from being lost when a client communicates with a multi-node system?

Answer 60

Sticky sessions or session persistence techniques.