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The data is arranged logically in a top-down format. In a hierarchical

Written on 2016-07-04 09:29:07 By Billy










A relational database is a collection of data items organized as a set of formally-described tables from which data can be accessed or reassembled in many different ways without having to reorganize the database tables.

2.5.3 Hierarchical Databases
The data is arranged logically in a top-down format. In a hierarchical database, data is grouped in records, which are subdivided into a series of segments. In a hierarchical database, the structure of the database is designed to reflect logical dependencies-certain data is dependent on the existence of certain other data. In a hierarchical database, the data relationships are defined.

The rules for queries are highly structured. It is these fixed relationships that give IMS extremely fast access to data when compared to a relational database. Speeds of access and query flexibility are factors to consider when selecting a DBMS.

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