What Do You Know About Hierarchical DBMS Client-Server Database Applications?

A large amount of search was conducted during 1960s. As a result, NAA (North American Aviation) developed a software known as GUAM (Generalized Update Access Method). GUAM was based on the concept that smaller components come together as part of larger components and so on, until the final product is assembled. This is like a hierarchical structure and thus known as hierarchical structure.
In the mid 1960s, IBM joined NAA to develop a system known as IMS (Information Management System). IMS is still the main hierarchical DBMS used by most large mainframe computers.

Client-Server Database Applications:
Earlier multi-user architectures used mainframe computer to process the database. The mainframe computer provides all the functions to the connected user directly. The mainframe contains the DBMS software, application programs, and user-interfaces. The users connected to the mainframe through their terminals. The remote users were connected to mainframe in a communication network.
In the mid 1980s, most users began to share data through local area network (LAN). The microcomputers were linked together in a LAN so that data and resources such as printers, storage devices etc could be shared. The LAN enabled the users to send data to one another through computers. The first application of LAN enabled the users to share the resources such as printers, storage devices (e.g., large capacity disk) and to communication via electronic mail. The end-users also wanted to share their database, which led to the development of multi-user database applications on LANs. After this, the Client-Server architecture was introduced to share data on the computer network.