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Questions and Answers
What is the primary purpose of caching in computer science and distributed systems?
What is the primary purpose of caching in computer science and distributed systems?
- To replace the need for databases in server-client communication
- To store all data objects and resources permanently
- To increase the load on the database for faster data retrieval
- To improve the efficiency and performance of systems by reducing the time and resources needed (correct)
Where does a cache typically store frequently accessed or recently used data objects?
Where does a cache typically store frequently accessed or recently used data objects?
- In a separate physical server
- In the same location as the primary database
- In a temporary storage area such as memory (correct)
- In a remote cloud storage system
What role does a cache play in reducing latency and database load?
What role does a cache play in reducing latency and database load?
- It increases latency by adding an extra step in data retrieval
- It directly connects the server to multiple databases for faster data access
- It completely replaces the need for communication between server and database
- It acts as a middle layer between the server and the database, storing frequently accessed data (correct)
Why is accessing data from a cache faster than accessing it directly from a database?
Why is accessing data from a cache faster than accessing it directly from a database?
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What happens if the cache does not have the requested data when the server tries to access it?
What happens if the cache does not have the requested data when the server tries to access it?
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Study Notes
Caching in Computer Science and Distributed Systems
- The primary purpose of caching is to reduce the average time it takes to access data by storing frequently accessed or recently used data objects in a faster, more accessible location.
Cache Storage and Location
- A cache typically stores frequently accessed or recently used data objects in a smaller, faster memory location, such as RAM (Random Access Memory) or a solid-state drive (SSD), which is closer to the application or server.
Role of Cache in Reducing Latency and Database Load
- A cache plays a crucial role in reducing latency and database load by providing a faster alternative to accessing data directly from a database, thus minimizing the number of requests made to the database and reducing the load on the database.
Accessing Data from Cache vs. Database
- Accessing data from a cache is faster than accessing it directly from a database because the cache is typically located in a faster, more accessible location, and the data is already retrieved and stored, eliminating the need for a database query.
Cache Miss
- If the cache does not have the requested data when the server tries to access it, a cache miss occurs, and the server must retrieve the data from the original source, usually the database, which can lead to increased latency and load on the database.
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