System Design
15 questions — answer mentally, then read the explanations
What you'll learn
- Try to answer each question before reading the explanation
- Cover System Design topics in system design
Questions
Read each question and options, then check the explanation below.
When designing caching systems, it's crucial to consider the trade-off between _________ and cache coherency.
- A. Cache Hit Ratio
- B. Cache Size
- C. Cache Invalidation
- D. Cache Prefetching
Explanation
Answer: Cache Size There is a trade-off between cache size and cache coherency in caching systems. Increasing cache size can improve hit ratio but may complicate cache coherency mechanisms, impacting overall system performance.
In distributed caching systems, _________ is a key challenge that must be addressed to maintain data consistency across multiple cache nodes.
- A. Cache Partitioning
- B. Cache Invalidation
- C. Cache Prefetching
- D. Cache Coherency
Explanation
Answer: Cache Coherency Cache coherency is a crucial challenge in distributed caching systems. Ensuring consistency across multiple cache nodes is essential to prevent data discrepancies and maintain a coherent view of the stored data.
In a scenario where an e-commerce platform experiences heavy traffic during flash sales, how can caching systems be utilized to alleviate pressure on the backend databases while ensuring accurate product information for users?
- A. Distribute cached product information across multiple servers
- B. Cache static product details and update dynamically changing information frequently
- C. Implement a cache eviction strategy to remove outdated product data
- D. Cache only images and multimedia content, leaving textual details for real-time retrieval
Explanation
Answer: Cache static product details and update dynamically changing information frequently Caching static product details and updating dynamically changing information frequently allows the system to serve accurate data quickly, reducing the load on backend databases during peak traffic.
In a real-time bidding system for online advertising, how can caching systems be integrated to improve response times and handle the high volume of ad requests?
- A. Cache frequently requested ad creatives and bidding information
- B. Utilize a cache for storing user profiles and bidding history
- C. Cache only historical bidding data for analytics purposes
- D. Avoid caching in real-time bidding systems for data accuracy
Explanation
Answer: Cache frequently requested ad creatives and bidding information Caching frequently requested ad creatives and bidding information enables quick responses and reduces the load on the backend by serving common requests from the cache.
A social media platform experiences a surge in user activity during peak hours. Describe how caching systems can be implemented to deliver personalized content efficiently while maintaining data consistency across users' feeds.
- A. Cache personalized user feeds with a short expiration time
- B. Implement cache partitioning based on user segments
- C. Use a distributed cache to synchronize user feed data across servers
- D. Cache only public posts to prioritize system performance
Explanation
Answer: Implement cache partitioning based on user segments Implementing cache partitioning based on user segments allows for efficient caching of personalized content while maintaining data consistency, ensuring that users receive relevant and up-to-date information during peak hours.
What is the primary purpose of a Content Delivery Network (CDN)?
- A. Speed up the delivery of web content by serving it from servers geographically closer to users
- B. Enhance website security by encrypting data transmission
- C. Streamline database operations for efficient data retrieval
- D. Optimize server resource utilization for better scalability
Explanation
Answer: Speed up the delivery of web content by serving it from servers geographically closer to users The primary purpose of a CDN is to speed up the delivery of web content by serving it from servers geographically closer to users. This reduces latency and enhances the overall user experience.
What is a key aspect of designing a scalable social media platform?
- A. User authentication and authorization
- B. Real-time updates and notifications
- C. Aesthetic user interface design
- D. Database normalization
Explanation
Answer: Real-time updates and notifications Real-time updates and notifications are crucial for a scalable social media platform, ensuring that users receive timely information and interactions.
Which of the following is NOT a primary concern when designing a social media platform for scalability?
- A. User engagement features
- B. Data security and encryption
- C. Load balancing
- D. Graphic design and branding
Explanation
Answer: Graphic design and branding While user engagement features, data security, and load balancing are critical for scalability, graphic design and branding are more focused on user experience and aesthetics.
Which architectural pattern is commonly used in the development of scalable social media platforms?
- A. Model-View-Controller (MVC)
- B. Microservices
- C. Singleton Pattern
- D. Observer Pattern
Explanation
Answer: Microservices Microservices architectural pattern is commonly employed in scalable social media platforms, allowing for independent and scalable components that communicate through APIs.
How does partitioning/sharding contribute to the scalability of a social media platform?
- A. Distributes data across multiple servers based on a certain criterion
- B. Consolidates data onto a single server for faster access
- C. Deletes unnecessary data to reduce storage requirements
- D. Encrypts data to ensure security
Explanation
Answer: Distributes data across multiple servers based on a certain criterion Partitioning or sharding involves distributing data across multiple servers based on a certain criterion, such as user ID or geographic location. This allows the system to handle a larger volume of data and requests by spreading the workload across multiple nodes.
Which database design strategy is crucial for ensuring efficient handling of user-generated content in a social media platform?
- A. Normalization
- B. Denormalization
- C. Vertical Partitioning
- D. Horizontal Partitioning
Explanation
Answer: Denormalization Denormalization is crucial for efficient handling of user-generated content in a social media platform. It involves reducing the number of joins needed to retrieve data by adding redundant information to the database. This helps improve query performance, especially for read-heavy workloads common in social media applications.
What role does caching play in enhancing the scalability of a social media platform?
- A. Reduces the need for database queries by storing frequently accessed data
- B. Increases the complexity of the system architecture
- C. Slows down data retrieval due to additional layers of processing
- D. Consumes excessive memory without significant performance improvement
Explanation
Answer: Reduces the need for database queries by storing frequently accessed data Caching plays a crucial role in enhancing the scalability of a social media platform by reducing the need for database queries. By storing frequently accessed data in memory, caching reduces the load on the database servers and improves response times for user requests.
What challenges might arise when scaling a social media platform to accommodate millions of users?
- A. Database bottlenecks
- B. User authentication issues
- C. Network latency
- D. Algorithmic inefficiencies
Explanation
Answer: Database bottlenecks Scaling a social media platform to handle millions of users can lead to database bottlenecks, affecting the platform's overall performance. Optimizing database queries and employing efficient indexing are crucial aspects of addressing this challenge.
How can event-driven architecture be beneficial for handling real-time interactions in a social media platform?
- A. Improved responsiveness
- B. Reduced server load
- C. Simplified data processing
- D. Enhanced security
Explanation
Answer: Reduced server load Event-driven architecture allows real-time processing of events, reducing server load by handling only relevant events. This responsiveness is vital for a social media platform, ensuring timely updates for users.
What strategies can be employed to mitigate the impact of sudden spikes in user activity on a social media platform's performance and availability?
- A. Load balancing
- B. Caching
- C. Rate limiting
- D. Asynchronous processing
Explanation
Answer: Rate limiting Rate limiting is a strategy to control the number of requests a user can make within a specific time frame. It helps prevent server overload during sudden spikes in user activity, ensuring a more stable and available social media platform.
Today's exercise: Review & recall
Revisit any questions you hesitated on. Write one-line answers in your own words.
Steps
- 1
First pass
Read each question and pick an answer without looking at the explanation.
- 2
Second pass
Expand explanations only for questions you missed or were unsure about.
- 3
Notes
Jot down 3 terms or patterns you want to remember from this batch.
