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CoreData

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CoreData vs Realm: What are the differences?

Key Differences between CoreData and Realm

1. Data Model Definition - In CoreData, the data model is defined using a visual modeling tool called Core Data Model Editor. - In Realm, the data model is defined using a code-driven approach, where objects and relationships are defined using classes and properties.

2. Data Persistence - CoreData supports both SQL-based and binary stores for persisting data. - Realm uses its own embedded object database to persist data, resulting in better performance and simplifying the persistence process.

3. Relationships - In CoreData, relationships between entities are defined using relationships in the data model. - In Realm, relationships are defined using properties in the object classes, providing more flexibility and simplicity in managing relationships.

4. Querying and Fetching - CoreData uses the NSFetchRequest API to fetch and query data, supporting complex queries with filtering, sorting, and grouping options. - Realm provides a simpler and more intuitive query language to fetch data, with support for filtering, sorting, and grouping operations directly on the object classes.

5. Thread Safety - CoreData requires explicit handling of multithreading and concurrency by implementing its own thread-safe mechanisms. - Realm is inherently thread-safe, allowing objects to be directly accessed and modified from multiple threads without the need for additional synchronization.

6. Performance - CoreData can be slower for complex queries or large data sets due to its reliance on SQL and the overhead of managed objects. - Realm is known for its superior performance, as it avoids the overhead of managed objects and utilizes an efficient file-based storage system.

In Summary, CoreData and Realm differ in their data model definition approach, data persistence methods, handling of relationships, querying and fetching options, thread safety mechanisms, and performance characteristics.

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Pros of CoreData
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    • 7
      Good
    • 3
      Elegant API
    • 3
      Cloud Syncing
    • 2
      React Native Support
    • 1
      Strong Adoption Growth

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    Cons of CoreData
    Cons of Realm
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        No offline support for web till now

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      What is CoreData?

      It is an object graph and persistence framework provided by Apple in the macOS and iOS operating systems. It allows data organized by the relational entity–attribute model to be serialized into XML, binary, or SQLite stores. It provides generalized and automated solutions to common tasks associated with object life cycle and object graph management, including persistence.

      What is Realm?

      The Realm Mobile Platform is a next-generation data layer for applications. Realm is reactive, concurrent, and lightweight, allowing you to work with live, native objects.

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      What companies use CoreData?
      What companies use Realm?
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      What tools integrate with CoreData?
      What tools integrate with Realm?
      What are some alternatives to CoreData and Realm?
      MySQL
      The MySQL software delivers a very fast, multi-threaded, multi-user, and robust SQL (Structured Query Language) database server. MySQL Server is intended for mission-critical, heavy-load production systems as well as for embedding into mass-deployed software.
      PostgreSQL
      PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions.
      MongoDB
      MongoDB stores data in JSON-like documents that can vary in structure, offering a dynamic, flexible schema. MongoDB was also designed for high availability and scalability, with built-in replication and auto-sharding.
      Redis
      Redis is an open source (BSD licensed), in-memory data structure store, used as a database, cache, and message broker. Redis provides data structures such as strings, hashes, lists, sets, sorted sets with range queries, bitmaps, hyperloglogs, geospatial indexes, and streams.
      Amazon S3
      Amazon Simple Storage Service provides a fully redundant data storage infrastructure for storing and retrieving any amount of data, at any time, from anywhere on the web
      See all alternatives