E

EA-enabled table space

A table space or index space that is enabled for extended addressability and that contains individual partitions (or pieces, for LOB table spaces) that are greater than 4 GB.

EB

Exabyte.

EBCDIC

Extended binary coded decimal interchange code. An encoding scheme that represents character data in the z/OS, VM, VSE, and iSeries environments. Contrast with ASCII and Unicode.

e-business

The transformation of key business processes through the use of Internet technologies.

embedded SQL

SQL statements that are coded within an application program.

See also [static SQL]

encoding scheme

A set of rules to represent character data (ASCII, EBCDIC, or Unicode).

entity

A significant object of interest to an organization.

environment

A collection of names of logical and physical resources that support the performance of a function.

equijoin

A join operation in which the join-condition has the form expression = expression.

escape character

The symbol that encloses an SQL delimited identifier. The escape character is the double quotation mark ("), except in COBOL applications, in which the user assigns the symbol, which is either a double quotation mark or an apostrophe (').

EUR

IBM European Standards.

exabyte

For processor, real and virtual storage capacities and channel volume: 1,152,921,504,606,846,976 bytes or 2⁶⁰.

exception table

A table that holds rows that violate referential constraints or check constraints that the CHECK DATA utility finds.

exclusive lock

A lock that prevents concurrently executing application processes from reading or changing data. Contrast with share lock and update lock.

executable statement

An SQL statement that can be embedded in an application program, dynamically prepared and executed, or issued interactively.

exit routine

A user-written (or IBM-provided default) program that receives control from DB2 to perform specific functions. Exit routines run as extensions of DB2.

expression

An operand or a collection of operators and operands that yields a single value.

extended recovery facility (XRF)

A facility that minimizes the effect of failures in z/OS, VTAM^®, the host processor, or high-availability applications during sessions between high-availability applications and designated terminals. This facility provides an alternative subsystem to take over sessions from the failing subsystem.

Extensible Markup Language (XML)

A standard metalanguage for defining markup languages; XML is a subset of Standardized General Markup Language (SGML). The less complex nature of XML makes the following tasks easier: writing applications that handle document types, composing and managing structured information, and transmitting and sharing structured information across diverse computing environments.

external function

A function for which the body is written in a programming language that takes scalar argument values and produces a scalar result for each invocation. Contrast with built-in function, sourced function, and SQL function.

external procedure

A user-written application program that can be invoked with the SQL CALL statement, which is written in a programming language. Contrast with SQL procedure.

external routine

A user-defined function or stored procedure that is based on code that is written in an external programming language.