IBM Informix

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IBM Informix is a family of relational database management system (RDBMS) developed by IBM. It is positioned as IBM's flagship data server for online transaction processing (OLTP) as well as integrated solutions. IBM acquired the Informix technology in 2001.[1]



Early history

Roger Sippl and Laura King worked at Cromemco, an early S-100/CP/M company, where they developed a small relational database based on ISAM techniques, as a part of a report-writer software package.

Sippl and King left Cromemco to found Relational Database Systems (RDS) in 1980. Their first product, Marathon, was essentially a 16-bit version of their earlier ISAM work, made available first on the C8000 from Onyx Systems.

At RDS, they turned their attention to the emerging RDBMS market and released their own product as Informix (INFORMation on unIX) in 1981. It included their own Informer language. It featured the ACE report writer, used to extract data from the database and present it to users for easy reading. It also featured the PERFORM screen form tool, which allowed a user to interactively query and edit the data in the database. The final release of this product was version 3.30 in early 1986.

In 1985, they introduced a new SQL-based query engine as part of INFORMIX-SQL (or ISQL) version 1.10 (version 1.00 was never released). This product also included SQL variants of ACE and PERFORM. The most significant difference between ISQL and the previous Informix product was the separation of the database access code into an engine process (sqlexec), rather than embedding it directly in the client — thus setting the stage for client-server computing with the database running on a separate machine from the user's machine. The underlying ISAM-based file storage engine was known as C-ISAM.

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