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MySQL, the most popular Open Source SQL database management system, is developed, distributed, and supported by Oracle Corporation.
PostgreSQL is a powerful, open source relational database system. It has more than 15 years of active development and a proven architecture that has earned it a strong reputation for reliability, data integrity, and correctness. It runs on all major operating systems, including Linux, UNIX (AIX
SQLite is a small C library that implements a self-contained, embeddable, zero-configuration SQL database engine. Implements most of SQL92 and ACID (atomic, consistent, isolated, and durable) transactions; no setup or administration needed.
hsqldb is a relational database engine written in Java with a JDBC driver that supports a subset of ANSI SQL:1999. It offers a small, fast database engine. Embedded and server modes are available. It includes tools such as a minimal Web server, in-memory query and management tools (which can be run
Firebird is a relational database offering many ANSI/ISO SQL standard features that runs on Linux, Windows, and a variety of Unix platforms. Firebird offers excellent concurrency, high performance, and powerful language support for stored procedures and triggers. It has been used in production
H2 is an SQL database engine written in Java. It is very fast and small (about 1 MB), and supports embedded, server, and clustering modes. A browser based console application is included. Disk based and in-memory tables and databases are supported. Some of its features are transactions
MariaDB is a community developed branch of MySQL. It's a branch of MySQL (ie, we are keeping our code in sync with MySQL) and contains in addition the Maria storage engine, updated version of other storage engines and extensions.
Ingres Database is the open source database management system that can reduce IT costs and time to value while providing the strength and features expected from an enterprise class database. Ingres Database is a leader in supporting business critical applications and helping manage the most
A database designed for the typical Web usage patterns for a database. It is being designed for massive concurrency on modern multi-cpu/core architecture. The code is originally derived from MySQL.
SchemaSpy analyzes database metadata to reverse engineer dynamic Entity Relationship (ER) diagrams. It works with just about any JDBC-compliant database (Oracle/MySQL/DB2/SQL Server/PostgreSQL/Sybase/etc.) and can identify Ruby on Rails as well as other implied relationships.
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