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Based on our record, H2 Database Engine should be more popular than OrientDB. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
First, you need to choose a specific graph database platform to work with, such as Neo4j, OrientDB, JanusGraph, Arangodb or Amazon Neptune. Once you have selected a platform, you can then start working with graph data using the platform's query language. - Source: dev.to / about 2 years ago
Not sure of your use case, maybe you could use an embedded database (ie h2). Source: over 3 years ago
There are in-memory databases such as H2 which you can use for testing that is just a library you import. However, syntax can vary between databases. So it's only really appropriate if you're also using something like Hibernate which abstracts away a lot of the differences. Source: over 3 years ago
ArangoDB - A distributed open-source database with a flexible data model for documents, graphs, and key-values.
Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
neo4j - Meet Neo4j: The graph database platform powering today's mission-critical enterprise applications, including artificial intelligence, fraud detection and recommendations.
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
SQLite - SQLite Home Page
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.