This free DBMS is available for all flavors of Unix and Linux systems and more recently for Windows
PostgreSQL is a capable, reliable system and offers good performance characteristics. It uses SQL,
the Structure Query Language. Its features include Transaction, Subselects, Views, Sophicticated locking,
Foreign Key Referential Integrity and a few others such as the ability to hold arrays of data.
It is suitable for various types of applications. The demand for webservers supporting this database has at least
doubledduring the last 3 years.
Much development for this DBMS has been done with PHP, Java and some with Python.