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Differences and characteristics between Redis and MySQL

Redis and MySQL are commonly used Linux business databases, but there are differences between them. Here Lao Zuo simply sorted out the characteristics and differences between the two databases.

1. Data storage mode:

Redis is a key value storage database based on memory. Data is stored in memory, so reading and writing speed is very fast. It also supports data persistence to disk to prevent data loss.

MySQL is a relational database management system (RDBMS). Data is stored on the hard disk, organized and stored in the form of tables.

2. Data model:

Redis uses the data model of key value pairs. Each key is associated with a specific value, and keys can be used for quick lookup and access.

MySQL uses a tabular data model. Data is organized in rows and columns, and supports complex relationships and join operations.

3. Data query:

Redis has a very efficient read and write speed, and supports various data types (such as string, list, hash, set, ordered set, etc.). It provides powerful cache functions and atomic operations, and is suitable for scenarios with high concurrency and high real-time requirements.

MySQL supports the SQL query language and can perform complex relational data queries and operations. It provides transaction processing, indexing, connection and other functions, and is suitable for application scenarios that need to maintain data consistency and perform complex data processing.

4. Data persistence:

Redis can persist data to disk to prevent data loss due to system restart or power failure. It supports two persistence modes: RDB (snapshot) and AOF (append log), and you can select the appropriate persistence mode according to your needs.

MySQL stores data on the hard disk, and uses the transaction log (Redo Log) and binary log (Binlog) to ensure data consistency and persistence.

5. Scalability:

Redis supports distributed architecture and can be horizontally expanded through master-slave replication, sharding, etc. to improve performance and capacity.

MySQL also supports master-slave replication and partition (sub table, sub database), but its scalability is weaker than that of Redis.

In conclusion, there are some differences between Redis and MySQL in terms of data storage mode, data model, query language, persistence and scalability. The choice of which database to use depends on the specific application requirements and scenarios. Redis is suitable for high-speed read and write, high real-time requirements, cache and counter scenarios; MySQL is suitable for complex data query, transaction processing, data relationship, connection and other application scenarios.

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