IBM's System R project:
IBM's System R project: IBM's System R was a pioneering research project from the 1970s at IBM's San Jose Research Laboratory (now part of IBM Almaden Research Center). It was the first implementation of SQL (Structured Query Language) and laid the foundation for modern relational database management systems (RDBMS). Key Contributions of System R: First Relational Database Implementation: It was one of the earliest practical implementations of Codd's relational model, which had been proposed in 1970. Birth of SQL: System R introduced Structured Query Language (SQL), which later became the standard for relational databases. Query Optimization: It introduced concepts like cost-based query optimization, which modern RDBMS still use. Transaction Management: Implemented ACID (Atomicity, Consistency, Isolation, Durability) properties, ensuring reliable transactions. Two-Level Architecture: Separated logical and physical database structures, making it more flexible. https://...