Oracle Rdb

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Rdb/VMS is a relational database management system (RDBMS) for the Hewlett-Packard OpenVMS operating system. It was originally created by Digital Equipment Corporation (DEC) in 1984 as part of the VMS Information Architecture, intended to be used for data storage and retrieval by high-level languages and/or other DEC products such as DATATRIEVE, RALLY, and TEAMDATA.

Product history

In 1994 DEC sold the Rdb division to Oracle Corporation where it was rebranded Oracle Rdb. Oracle is still enhancing and developing this product in 2011 (although "Oracle Database" products like Oracle 10g get the lion's share of Oracle's advertising budget). It currently runs on OpenVMS for VAX, Alpha and IA-64 . It used to run on DEC Tru64 and Microsoft Windows NT, Demand for the Tru64 version was so low that support was dropped. The Microsoft Windows NT port was never released as Oracle could not obtain support on the compilers necessary for this platform.

Rdb featured one of the first cost-based optimizers, and after acquisition Oracle introduced a cost-based optimizer in its regular Oracle RDBMS product.

Data access

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:

  1. embedding RDO statements in the source file then running it through a precompiler
  2. :(example: "file.RCO" is pre-compiled into "file.COB")
  3. embedding SQL statements in the......
  4. ...

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