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MySQL, the most popular Open Source SQL database management system, is developed, distributed, and supported by MySQL AB. MySQL AB is a commercial company, founded by the MySQL developers. It is a second generation Open Source company that unites Open Source values and methodology with a successful business model.
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
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operating systems, including Linux, UNIX (AIX, BSD, HP-UX, SGI IRIX, Mac OS X, Solaris, Tru64), and Windows. [Less]
Model-based data export tool. Exports consistent, referentially intact row-sets from relational databases. Removes obsolete data without violating integrity. DBMS agnostic (JDBC). Generates hierarchically structured XML and topologically sorted SQL-DML.
dub manages databasemodifications (schema-evolution) during the development process/maintenance. It centralizes the changes, in order to execute them to the target database, and will keep an overview of all exising changes (new, current and past).