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HDBMS (Hierarchical Database Management System) is a type of DBMS that supports a hierarchical data model.

Example HDBMS Systems:

  • Lotus Notes (the most popular HDBMS in use today)
  • IMS - IBM's Information Management System (first HDBMS)
  • System 2000

The HDBMS was largely replaced by the RDBMS (Relational DBMS) in the late 70's and early 80's.

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