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Realm vs Redis: What are the differences?
Introduction
In the realm of database management systems, two popular choices that are often compared are Realm and Redis. These systems offer distinct features and functionalities that cater to different needs and use cases. Let's explore the key differences between Realm and Redis.
Data Model: Realm is an object-oriented database that stores data as objects with properties and relationships, making it easier to work with data in an application. On the other hand, Redis is a key-value store that operates with simple data structures like strings, lists, sets, and hashes.
Persistence: Realm offers built-in support for offline data synchronization, meaning data can be stored locally and then synced with a server when a connection is available. Redis, on the other hand, is an in-memory database that can optionally persist data to disk.
Scalability: Redis is known for its high performance and scalability, making it a preferred choice for applications requiring fast read and write operations. Realm, on the other hand, may not be as performant as Redis in scenarios where massive scalability is required.
Data Querying: Redis supports various data querying options through its powerful set of commands, making it suitable for scenarios that require complex data manipulation and analysis. Realm, on the other hand, may be more suitable for simpler data querying needs within the context of an application.
Deployment: Redis is often used as a standalone server or as a cluster for high availability and scalability. Realm, on the other hand, is typically integrated within the application codebase, simplifying deployment but potentially limiting scalability options.
Use Cases: Realm is commonly used in mobile and IoT applications where offline capabilities are vital, while Redis is often implemented in high-performance scenarios like caching, session management, real-time analytics, and message queues.
In Summary, Realm and Redis differ in their data models, persistence mechanisms, scalability, querying capabilities, deployment options, and target use cases.
Pros of Realm
- Good7
- Elegant API3
- Cloud Syncing3
- React Native Support2
- Strong Adoption Growth1
Pros of Redis
- Performance886
- Super fast542
- Ease of use513
- In-memory cache444
- Advanced key-value cache324
- Open source194
- Easy to deploy182
- Stable164
- Free155
- Fast121
- High-Performance42
- High Availability40
- Data Structures35
- Very Scalable32
- Replication24
- Great community22
- Pub/Sub22
- "NoSQL" key-value data store19
- Hashes16
- Sets13
- Sorted Sets11
- NoSQL10
- Lists10
- Async replication9
- BSD licensed9
- Bitmaps8
- Integrates super easy with Sidekiq for Rails background8
- Keys with a limited time-to-live7
- Open Source7
- Lua scripting6
- Strings6
- Awesomeness for Free5
- Hyperloglogs5
- Transactions4
- Outstanding performance4
- Runs server side LUA4
- LRU eviction of keys4
- Feature Rich4
- Written in ANSI C4
- Networked4
- Data structure server3
- Performance & ease of use3
- Dont save data if no subscribers are found2
- Automatic failover2
- Easy to use2
- Temporarily kept on disk2
- Scalable2
- Existing Laravel Integration2
- Channels concept2
- Object [key/value] size each 500 MB2
- Simple2
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Cons of Realm
- No offline support for web till now1
Cons of Redis
- Cannot query objects directly15
- No secondary indexes for non-numeric data types3
- No WAL1