> For the complete documentation index, see [llms.txt](https://gchandra.gitbook.io/big-data-and-tools-with-nosql/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gchandra.gitbook.io/big-data-and-tools-with-nosql/nosql/redis/redis-rdbms-mysql.md).

# 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?**

<figure><img src="https://1471795080-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FrtXPLjVTxuTGIysjCx89%2Fuploads%2F7120wOcdOFqz6ZyBl0Dw%2Fimage.png?alt=media&amp;token=79b3b25b-bac6-490e-8eee-fd25c011388e" alt=""><figcaption></figcaption></figure>

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.&#x20;