Câu hỏi phỏng vấn [Global] Caching
Câu hỏi

Is Redis just a cache?

Câu trả lời

Redis is not just a cache; it is a versatile in-memory data structure store that can be used for a variety of purposes beyond caching. Here are some key points to consider:

Versatility of Redis

  1. Data Structures: Redis supports multiple data structures such as strings, hashes, lists, sets, sorted sets, bitmaps, hyperloglogs, and streams. This makes it suitable for a wide range of applications beyond simple key-value storage[1][3][6][16].

  2. Persistence: Unlike traditional caches, Redis offers persistence options. It can write data to disk using snapshotting (RDB) or journaling (AOF), ensuring data durability even in the event of a system crash[3][16].

  3. Advanced Use Cases: Redis can be used for session management, real-time analytics, message brokering, and as a primary database for applications where data does not change frequently. It is also used in social media applications for managing user profiles, relationships, and timelines[1][6][17][18].

  4. High Performance: Redis is known for its high-speed read and write operations due to its in-memory nature, making it ideal for real-time data processing and applications requiring low-latency access[1][3][5][10].

  5. Scalability and Replication: Redis supports master-slave replication, clustering, and sharding, which allows it to scale horizontally and provide high availability and fault tolerance[3][16][18].

Comparison with Other Databases

  1. Relational Databases (RDBMS): Redis differs from RDBMS in that it does not use tables, rows, and columns. Instead, it uses key-value pairs and supports various data types. While RDBMSs provide full ACID compliance, Redis offers selective consistency and does not fully guarantee ACID properties[1][3].

  2. Other NoSQL Databases: Compared to other NoSQL databases like MongoDB, Redis is faster due to its in-memory storage but may not be as suitable for complex querying and large data volumes that require persistent storage[1][5][10][11].

Caching Capabilities

Redis excels as a caching solution due to its sub-m...

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