PostgreSQL allows Navy organizations to move away from proprietary relational database management systems (RDBMSs), such as Oracle and Microsoft SQL Server, and free themselves of high license fees, maintenance costs, and the constraints of vendor lock-in. Thanks to a vibrant open source community, PostgreSQL today is a highly robust, reliable, and secure open source option that meets the diverse needs of large, complex enterprises. And it does so while dramatically reducing cost of ownership and offering functional flexibilities not possible with proprietary alternatives.