Database Models
Relational database
- Codd, E.F. (1970). A relational model for large shared data banks. CACM, 13(6), 377-87.
- First relational prototype - IBM’s system/R
- Other variants, e.g., INGRES - UC, Berkeley
- 1983 IBM released DB2
Relational databases required considerable computing resources (not feasible until mid- 1980s)
- low end (Access, Paradox, dBase, FoxPro, Clipper)
- high end (DB2, Oracle, Sybase, Informix, INGRES commercial)