<P> IBM started working on a prototype system loosely based on Codd's concepts as System R in the early 1970s . The first version was ready in 1974 / 5, and work then started on multi-table systems in which the data could be split so that all of the data for a record (some of which is optional) did not have to be stored in a single large "chunk". Subsequent multi-user versions were tested by customers in 1978 and 1979, by which time a standardized query language--SQL--had been added . Codd's ideas were establishing themselves as both workable and superior to CODASYL, pushing IBM to develop a true production version of System R, known as SQL / DS, and, later, Database 2 (DB2). </P> <P> Larry Ellison's Oracle Database (or more simply, Oracle) started from a different chain, based on IBM's papers on System R. Though Oracle V1 implementations were completed in 1978, it wasn't until Oracle Version 2 when Ellison beat IBM to market in 1979 . </P> <P> Stonebraker went on to apply the lessons from INGRES to develop a new database, Postgres, which is now known as PostgreSQL . PostgreSQL is often used for global mission critical applications (the . org and . info domain name registries use it as their primary data store, as do many large companies and financial institutions). </P> <P> In Sweden, Codd's paper was also read and Mimer SQL was developed from the mid-1970s at Uppsala University . In 1984, this project was consolidated into an independent enterprise . In the early 1980s, Mimer introduced transaction handling for high robustness in applications, an idea that was subsequently implemented on most other DBMSs . </P>

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