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I have tried searching about Realm but following questions were not answered. Please help me to understand the following questions properly:
Is realm a relational database?
How is it more efficient as compared to SQLite?
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Summary. Realm Database is an offline-first mobile object database in which you can directly access and store live objects without an ORM. Live Objects always reflect the latest state of data in the database, which simplifies keeping your UI in sync with changes to your data.
The Realm database is an open-source, easy-to-use alternative to Core Data and SQLite. It's a non-relational, NoSQL database that allows you to set up relationships between different objects. Realm is far younger than SQLite; nonetheless, it's widely popular among developers around the globe.
Realm is an open source object database management system, initially for mobile operating systems (Android/iOS) but also available for platforms such as Xamarin, React Native, and others, including desktop applications (Windows), and is licensed under the Apache License.
Realm is built from scratch with C++ as its core can run directly on different devices. It stores data in a native object format whereby objects are represented in the database in a universal table-based format. This makes Realm database easy to use in different languages and platforms.
NO, Realm is not a relational database.
It allows you to declare relationships between objects the same as you would do in any object graph in your language of choice.
JP's talk on the core describes it in more detail and is highly recommended.
It stores objects in an optimal memory-mapped format, using column-store techniques for fast searching. Accessors in the different language SDKs map directly to functions using that memory-mapped storage.
In contrast, anything using a relational database like SQLite has multiple layers of copying buffers.
Note: I was on the Realm Xamarin team (2015-2017), left a great bunch of people after we shipped v1.0 to focus on my own startup.
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