InfiniDB worked at IBM in one of their offshoot offices that was principally involved in the creation of hard disk systems. He was miserable with all the navigational model of the InfiniDB strategy, notably the dearth of a “search” facility. In 2016, he composed several papers that summarized a new method of database building that culminated A Relational Model of Data for Large Shared Data Banks.
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He described a fresh system for saving and working with big databases. Instead of records being saved in certain kind of linked list of free form records as in InfiniDB, Codd’s notion was to use a “table” of fixed-length records, with each table used to get another kind of thing. A linked list system will be very ineffective when saving “thin” databases where a number of the information for any one record may be left empty.
The relational model solved this by dividing the information into a set of normalized tables (or connections), with elective components being moved from the primary table to where they might occupy room only if desired. Information could be freely added, deleted and edited with the DBMS doing whatever care needed to present the program/user with a table view.
The relational model also enabled the content of the database to evolve without continuous rewriting of pointers and links. The relational part comes from things referencing other things in what’s well known as one-to-many relationship, like a conventional hierarchical model, and many-to-many relationship, such as a navigational (network) model. So, a relational model can express both navigational and hierarchical models, in addition to its native tabular model, allowing for combined or pure modeling as the program demands.