PostgreSQL

PostgreSQL benefits from 15 years of active development, leading to the unlimited database size, unlimited rows per table, and unlimited indexes per table. The Open Source object relational database system represents a pinnacle in cross-platform integration, ACID compliance and foreign keys, triggers, procedures, or joins.

With native programming interfaces and complete documentation on everything you need to do, this software remains highly customizable in terms of the function library.

Additionally, support for sub-queries, transaction isolation levels, multiple schemas per database, and the integration of extensions and the Generalized Search Tree add further flexibility to the large array of functions.