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Concept
Oracle Rdb
Résumé
Oracle Rdb is a relational database management system for the OpenVMS operating system. It was originally released by Digital Equipment Corporation (DEC) in 1984 as VAX Rdb/VMS.
Rdb was a component of the VAX Information Architecture, and was designed to interoperate with other Digital database tools and application frameworks such as the Application Control Management System, Datatrieve and the Common Data Dictionary. It originally provided a proprietary query interface known as the Relational Data Operator (RDO), but later gained support for ANSI SQL.
In 1994 DEC sold the Rdb division to Oracle Corporation where it was rebranded Oracle Rdb. As of 2020, Oracle is still actively developing Rdb, with over half of the codebase developed under Oracle's ownership. Version 7.0 ran on OpenVMS for VAX and Alpha, version 7.1 on Alpha only, and versions 7.2 to 7.4 on Alpha and IA-64 (Itanium).
Rdb featured one of the first cost-based optimizers, and after acquisition Oracle introduced a cost-based optimizer in its regular Oracle RDBMS product.
On March 22, 2011, Oracle announced it had decided to end all software development on the Itanium, and that Oracle Rdb 7.3 would be the last major version released by Oracle. Due to a lawsuit filed by HP against Oracle, Oracle was ordered to continue porting its software to Itanium computers for as long as HP (now Hewlett Packard Enterprise) sells Itanium computers.
Despite the announcement that 7.3 would be the last major release, Oracle released version 7.4.1.0 of Rdb in August 2020 for OpenVMS on both Alpha and Itanium. In November 2020, Oracle announced that they are in the process of porting Rdb 7.4 to the x86-64 port of OpenVMS.
Interactive access to the Oracle Rdb can be by SQL (Structured Query Language), RDO (Relational Database Operator), or both.
High level languages usually access Oracle-Rdb by:
embedding RDO statements in the source file then running it through a precompiler
(example: "file.RCO" is pre-compiled into "file.
Source officielle
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