The term b-tree refers to a way of organizing databaseinformation so that you can quickly search through it to find exactly what you're looking for. B-tree is a way of organizing database keys so you can quickly search them on disk.
An important class of digraph, which involves for the description of hierarchy. A directed tree is an acyclic digraph which has one node called root with in degree 0, while other nodes have in degree Every directed tree must have at least one node.
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