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PostgreSQL, often simply Postgres, is an object-relational database (ORDBMS) i.e. an RDBMS, with additional (optional use) "object" features with an emphasis on extensibility and standards compliance.

As a database server, its primary functions are to store data securely and return that data in response to requests from other software applications.

It can handle workloads ranging from small single-machine applications to large Internet-facing applications (or for data warehousing) with many concurrent users; on macOS Server, PostgreSQL is the default database; and it is also available for Microsoft Windows and Linux (supplied in most distributions).

MySQL (officially pronounced as "My S-Q-L") is an open-source relational database management system (RDBMS).

Its name is a combination of "My", the name of co-founder Michael Widenius' daughter, and "SQL", the abbreviation for Structured Query Language.

The MySQL development project has made its source code available under the terms of the GNU General Public License, as well as under a variety of proprietary agreements.

MySQL was owned and sponsored by a single for-profit firm, the Swedish company MySQL AB, now owned by Oracle Corporation.

For proprietary use, several paid editions are available, and offer additional functionality.

Open Text Corporation is a Canadian company that develops and sells enterprise information management (EIM) software.

A NoSQL (originally referring to "non SQL", "non relational" or "not only SQL") database provides a mechanism for storage and retrieval of data which is modeled in means other than the tabular relations used in relational databases.

Such databases have existed since the late 1960s, but did not obtain the "NoSQL" moniker until a surge of popularity in the early twenty-first century, triggered by the needs of Web 2.0 companies such as Facebook, Google, and Amazon.com.

NoSQL databases are increasingly used in big data and real-time web applications.

NoSQL systems are also sometimes called "Not only SQL" to emphasize that they may support SQL-like query languages.

Documentum is an enterprise content management platform, now owned by OpenText, as well as the name of the software company that originally developed the technology.

EMC acquired Documentum for $1.7 billion in December, 2003.

The Documentum platform was part of EMC's Enterprise Content Division (ECD) business unit, one of EMC's four operating divisions.