R

RAM:

Random access memory. RAM is the memory chips inside our computer. RAM provides an ultra fast buffering storage area between CPU (the processor), and your I/O devices (disks).

RDBMS:

See Relational Database Management System .

Real Simple Syndication:

The latest version of RSS implies syndication and standardization of Web Services and web feeds online. See Rich Site Summary .

Record:

Tables are divided into fields and records. Fields impose structure and data type specifics onto each of the field values, in each record.

Referential Integrity:

Referential integrity is a process (usually contained within a relational database model) of validation between related primary and foreign key field values. For instance, a foreign key value cannot be added to a table unless the related primary key value exists in the parent table. Similarly, deleting a primary key value necessitates removing all records in subsidiary tables, containing that primary key value in foreign key fields. Additionally, it follows that preventing the deletion of a primary key record is not allowed if a foreign key exists elsewhere.

Relational Database Management System:

A relational database contains tables with data. The management system part is the part allowing you access to that database, and the power to manipulate both the database and the data contained within it.

Relational Database Model:

The relational database model provides a two-dimensional structure to data. The relational database model more or less throws out the window the concept and restriction of a hierarchical structure, but does not completely abandon data hierarchies. Any table can be accessed directly without having to access all parent objects. Precise data values, such as primary keys, are required in order to facilitate skirting the hierarchy, to find individual records, in specific tables.

Relative Path :

A path through data from a specified point within that data (usually the currently actively accessed node).

Repository:

Another term for a storage medium, such as a relational database, an XML document, or a native XML database.

Reserved Character:

A character that is reserved by a compiler or interpreter, as having s specific meaning. For example, in the expression x+y, the plus sign means addition, and not the word plus.

Reserved Word:

This is a special word, in programming syntax known as a token that has special meaning to a programming language.

Restriction (DTD):

See Constraint .

Rich Site Summary:

RSS allows construction of XML in a specialized manner. RSS yields richly formatted and interpretable XML content for a specific application or industry. RSS is often used for news feeds on the Internet. RSS is also known as Real Simple Syndication. See Real Simple Syndication .

ROLLBACK:

This command undoes any database changes not yet committed to the database using the COMMIT command.

Root:

The root or topmost element of an upside-down tree.

Root Node:

See Root .

Row:

See Record .

RSS:

See Rich Site Summary and Real Simple Syndication .