The best Relational Database alternative to Oracle Database is SQLite, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Oracle Database and many of them are Relational Databases so hopefully you can find a suitable replacement. Other interesting Relational Database alternatives to Oracle Database are PostgreSQL, MySQL Community Edition, MongoDB and Microsoft SQL Server.
SQLite is a software library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine. SQLite is the most widely deployed SQL database engine in the world. The source code for SQLite is in the public domain.
PostgreSQL is a powerful, open source object-relational database system with over 35 years of active development that has earned it a strong reputation for reliability, feature robustness, and performance.
MySQL Community Edition is a freely downloadable version of the world's most popular open source database that is supported by an active community of open source developers and enthusiasts.
MongoDB is a document database with the scalability and flexibility that you want with the querying and indexing that you need
SQL Server delivers on Microsoft’s Data Platform vision by helping your organization manage your data by enabling you to store data from structured, semi-structured, and unstructured documents within the database.
Tibero is an Oracle compatible SQL RDBMS that is secure, scales easily and conforms to today’s cost optimized cloud architectures.
The Apache Cassandra database is the right choice when you need scalability and high availability without compromising performance.
Amazon Relational Database Service (Amazon RDS) is a collection of managed services that makes it simple to set up, operate, and scale databases in the cloud. Choose from seven popular engines — Amazon Aurora with MySQL compatibility, Amazon Aurora with PostgreSQL compatibility...
Cockroach is a distributed key/value datastore which supports ACID transactional semantics and versioned values as first-class features. The primary design goal is global consistency and survivability, hence the name.
Amazon Redshift uses SQL to analyze structured and semi-structured data across data warehouses, operational databases, and data lakes, using AWS-designed hardware and machine learning to deliver the best price performance at any scale.
Part of the Azure SQL, Azure SQL Database is an always-up-to-date, fully managed relational database service built for the cloud. Build your next app with the simplicity and flexibility of a multi-model database that scales to meet...
H2 is a relational database management system written in Java. It can be embedded in Java applications or run in the client-server mode. The disk footprint (size of the jar file) is about 1 MB.
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First of all its most comparable to Oracle compared to the other solutions in this list. You are not limited to JSON, don't neet to jump to NoSQL. This doesn't mean that PostgreSQL is a FOSS alternative to Oracle. Programming in the database is quite different.