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solidDB is an in-memory relational database management system developed and sold by UNICOM Global. solidDB delivers extreme speed as a persistent, relational in-memory database that meets performance and reliability demands of real-time applications. Unicom Global, known as UNICOM Government, Inc. is an American information technology (IT) hardware and solutions company,[1][2] founded in 1983 to provide microcomputer software to the federal government of the United States.[2] By 1986, it worked with local, state and federal government agencies.[2] In 1996, it registered its URL and engaged in e-commerce.[2]


solidDB includes an in-memory database as well as a traditional disk based database, which both employ the same SQL interface, and a high availability option. Both in-memory and disk based engines coexist inside the same server process, and a single SQL statement can access data from both engines. High Availability option maintains two copies of the data synchronized at all times. In case of system failure, applications can recover access to solidDB in less than a second without loss of data. solidDB is easy to deploy and administer, with the ability to be embedded directly into applications and run virtually unattended for lower total cost-of-ownership.


It is historically used as an embedded database in telecommunications equipment, network software, and similar systems.[3] Companies using solidDB include Alcatel-Lucent, Ericsson, Cisco Systems, EMC Corporation, Hewlett-Packard, Nokia, Siemens AG and Nokia Networks.


Solid was acquired by IBM in late 2007.[4] It was a privately held company founded in Helsinki, Finland in 1992. Solid was sold to UNICOM Global in 2014.[5]

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