A graph database (gdb) is a database that uses graph structures for semantic queries with nodes, edges, and properties to represent and store data [1] a key concept of the system is the graph (or edge or relationship). Centos (/ ˈsɛntɒs /, from community enterprise operating system [7][8] in january 2014, centos announced the official joining with red hat while staying. This article presents a timeline of events in the history of computer operating systems from 1951 to the current day For a narrative explaining the overall developments, see the history of operating systems.
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