Rdb


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Rdb

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rdb

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A roll-your-own database, created in the Unix toolkit philosophy. It appears to be written in the awk language, and is very compatible with awk. It uses awk's syntax and can be combined with awk commands.

The definitive introduction is "Unix Relational Database Management: Application Development in the Unix Environment", by Rod Manis, Evan Schaeffer, and Robert Jorgensen, published by Prentice Hall. The book tells how to use rdb to create database/spreadsheets in the awk tradition, only easier. It's a good way to get into programming for novices. It's also a good way to learn DB theory and construction quite painlessly.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

Oracle Rdb

(Oracle Relational DataBase) A relational DBMS that runs under OpenVMS on Digital's VAX and Alpha systems. Rdb was originally developed by Digital and widely used on VAX systems. Oracle acquired it in 1994 and enhanced the product.

relational database

A database that maintains a set of separate, related files (tables), but combines data elements from the files for queries and reports when required. The concept was developed in 1970 by Edgar Codd, whose objective was to accommodate a user's ad hoc request for selected data. Most every business database management system (DBMS), including Oracle, DB2, SQL Server, MySQL, etc., is a relational DBMS (RDBMS) (see DBMS).

Hierarchical, Network and Object Databases
In non-relational "hierarchical" and "network" databases, records in one file contain embedded pointers to the locations of records in another, such as customers to orders and vendors to purchases. These are fixed links set up ahead of time to speed up daily processing. Another type of non-relational database is the "object database," which stores data consistent with their object model (see object database).

Comparing and Joining
Routine queries to a relational database often require data from more than one file. For example, to obtain the names of customers who purchased a particular product, data must be extracted from both the customer and order files. A relational DBMS has the flexibility to "join" two or more files by comparing key fields such as account number and name and generating a new file from the records that meet the matching criteria (see join).

Indexes Are Used
In practice, a pure relational query can be very slow. In order to speed up the process, indexes are built and maintained on the key fields used for matching. Sometimes, indexes are created "on the fly" when the data are requested.

Relational Terms       Common Term

  Table or Relation      File

  Row or Tuple           Record

  Column or Attribute    Field



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