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Redis - (RDBMS) MySql
Can Redis replace MySQL?
MySQL:
- A relational database management system (RDBMS).
- Uses structured query language (SQL) for database access.
- Ideal for complex queries and joins.
- Data is stored in tables with rows and columns.
- ACID-compliant (Atomicity, Consistency, Isolation, Durability).
Redis:
- An in-memory data structure store.
- Not a traditional RDBMS, but a NoSQL database.
- Data is stored as key-value pairs.
- Fast performance due to in-memory storage.
- There is limited support for complex queries and no support for joins.
Similarities:
- Data Storage: Both can store data, but Redis does so in memory and is more limited in data types.
- Persistence: Redis offers persistence mechanisms, allowing it to store data permanently like MySQL.
Differences:
- Data Modeling: Redis doesn't support relational data modeling. Data relationships are managed differently, often requiring denormalization or secondary indexing.
- Remember 1 - 1, 1 - n, n - n mapping?
- Query Capability: Redis has limited query capabilities compared to MySQL. It doesn't support SQL or complex queries involving multiple tables.
Scenarios where Redis can be used like MySQL:
- Simple Data Storage: For applications that require simple key-value data storage.
- Caching: Redis is often used alongside MySQL to cache query results, reducing load on the MySQL database.
- Session Storage: Storing user session data doesn't require complex querying.
- Queue Systems: Implementing queues for message brokering, which is not a typical use case for MySQL.
So, can Redis finally replace MySQL?
While Redis can handle some database functionalities similar to MySQL, it's not a complete replacement for a relational database system. Redis is often used with databases like MySQL to leverage its fast caching, session storage, and real-time operations performance.