- EBCDIC (extended
binary-coded decimal interchange code)
- A coded character set of
256 8-bit characters developed for the representation of textual data. EBCDIC
is not compatible with ASCII character coding. See also ASCII.
- ECB
- See event control block (ECB).
- ECDSA
- See extended CICS dynamic storage area (ECDSA).
- ECI
- See external call interface.
- ECKD device
- See extended count-key-data device (ECKD device).
- ECSA
- See extended common system area (ECSA).
- EDF
- See execution diagnostic facility (EDF).
- EEQE
- See extended error queue element (EEQE).
- EIB
- See EXEC interface block (EIB).
- EIP
- See execution interface program (EIP).
- EJB
- See Enterprise JavaBeans.
- ejb-jar file
- A file containing
Java classes for one or more enterprise beans, in compressed form, with a
single deployment descriptor that describes the characteristics of each of
the beans. See also CICS-deployed JAR file.
- ELPA
- See extended link pack area (ELPA).
- emergency restart
- The CICS backout facility for an automatic restart
following a system failure. It restores the recoverable resources updated
by each interrupted transaction to the condition they were in when the transaction
started.
- EMP
- See event monitoring point (EMP).
- empty range
- The part
of a VSAM file that is available for insertion of new records.
- emulation
program
- A program that allows a host system to communicate with
a workstation in the same way as it would with the emulated terminal. In IBM
CICS Clients, the terminal emulation function allows client workstations to
run CICS transactions that use 3270 data flows.
- end bracket
- In
SNA, the value (binary 1) of the end bracket indicator in the request header
(RH) of the first request of the last chain of a bracket; the value denotes
the end of the bracket. See also conditional end bracket (CEB).
- end-of-chain
(EOC)
- In SNA, an exception condition that occurs when the end-of-chain
indicator is set in the request/response unit (RU) returned from VTAM.
- end-of-day statistics
- (1) In CICS Transaction Server, CICS statistics
written to an SMF data set at the quiesce or termination of a CICS run, or
at a user-specified time. See also interval statistics, unsolicited statistics.
- (2) In CICS/VSE, CICS statistics written to the CSSL transient data
destination at the quiesce or termination of a CICS run, or at a user-specified
time. End-of-day statistics are reset by an end-of-day statistics collection.
- end-of-file (EOF)
- On a data medium, a coded character indicating
the end of the medium.
- end-of-file label
- In a file, an internal
label indicating the end of the file.
- end-of-message (EOM)
- In a DBCTL multisegment command, the ENTER key, which is the indicator
that defines the end of the last or only segment. See also end-of-segment (EOS).
- end-of-segment (EOS)
- In a DBCTL multisegment command, the command
recognition character followed by the ENTER key, which indicates the end of
each segment preceding the last segment. See also end-of-message (EOM).
- end session handler
- A user-provided part of a FEPI application
that handles end of conversation and end of session processing.
- enqueued
- The state of a task scheduled to update a physical segment of a database when
another task is currently accessing that segment.
- enterprise bean
- A component that implements a business task or business entity
and resides in an EJB container. Entity beans, session beans, and message-driven
beans are all enterprise beans. (Sun)
- Enterprise JavaBeans (EJB)
- A component architecture defined by Sun Microsystems for the
development and deployment of object-oriented, distributed, enterprise-level
applications.
- Enterprise Systems Architecture (ESA/370, ESA)
- The extension to
the IBM System/370 architecture that includes the advanced addressability
feature.
- entity
- A user, group, or resource that is defined to RACF.
- entity bean
- In EJB, an enterprise bean that represents persistent
data maintained in a database. Each entity bean carries its own identity.
(Sun) There are two types of entity beans: container-managed persistence
(CMP) entity beans and bean-managed persistence (BMP) entity beans. See also session bean.
- entry-sequenced data set (ESDS)
- A VSAM data set whose records are physically in the same order
in which they were put in the data set. It is processed by addressed direct
access or addressed sequential access and has no index. New records are added
at the end of the data set.
- entry thread
- A thread which
is used by the CICS DB2 attachment facility for transactions with special
requirements, such as high priority transactions, or transactions with special
accounting needs. See also command thread and pool thread.
- Environmental Record Editing and Printing (EREP)
- The program that
makes the data contained in the system recorder file available for further
analysis.
- Environment Services System Services (ESSS)
- A component of CICSPlex
SM that implements the formal MVS/ ESA subsystem functions required by the
product. ESSS provides cross-memory services, data space management, connection
services, and lock management. An ESSS system address space is created at
CICSPlex SM initialization and remains in the MVS image for the life of the
IPL.
- EOC
- See end-of-chain (EOC).
- EOF
- See end-of-file (EOF).
- EOM
- See end-of-message (EOM).
- EOS
- See end-of-segment (EOS).
- EPI
- See external presentation interface (EPI).
- EPVT
- See error processor vector table (EPVT).
- equivalent
- In an XRF environment, the mutual attribute of any
two DBCTL subsystems that are members of the same RSE. See also recoverable service element (RSE) and recoverable service table (RST).
- ER
- See exception response (EX, ER).
- erase-on-scratch
- The physical overwriting of data on a DASD data set when the
data set is deleted (scratched).
- ERDSA
- See extended read-only dynamic storage area (ERDSA).
- EREP
- See Environmental Record Editing and Printing (EREP)
- error processor
vector table (EPVT)
- A table containing addresses of the error
group processors invoked by the routing mechanism of the node error program.
- error status block (ESB)
- A recording area in a node error block
(NEB) of the node error table.
- error status element (ESE)
- In the terminal error block of the terminal error table, a field
that records occurrences of a particular type of error associated with a terminal.
- ESA
- See Enterprise Systems Architecture (ESA, ESA/370;).
- ESA/370
- See Enterprise Systems Architecture (ESA, ESA/370;).
- ESA mode
- An operation mode of the supervisor (generated with MODE=ESA)
of a VSE system. Such a supervisor will run on a 370-XA or Enterprise Systems
Architecture processor and provides support for multiple virtual address spaces,
the channel subsystem, and more than 16MB of real storage.
- ESB
- See error status block (ESB).
- ESDS
- See entry-sequenced data set (ESDS).
- ESDSA
- See extended shared dynamic storage area (ESDSA).
- ESE
- See error status element (ESE).
- ESM
- See external security manager (ESM).
- ESQA
- See extended system queue area (ESQA).
- ESSS
- See Environment Services System Services (ESSS).
- ETR
- See external throughput rate (ETR).
- EUDSA
- See extended user dynamic storage area (EUDSA).
- event
- A means by which CICS business transaction
services inform an activity that an action is required or an action has completed.
An activity can define events (by naming them) about which it wants to be
informed.
- event control block (ECB)
- A control block used to represent the
status of an event.
- event monitoring point (EMP)
- Point in the CICS code at which CICS monitoring data is collected.
There are two types of EMP: system-defined EMP, which collects predetermined
CICS monitoring information and which cannot be relocated, and user-defined
EMP, which collects task monitoring information. See also monitoring control table (MCT).
- event pool
- The set of events recognized by an activity (system
events and user events that have been defined to it). Each activity has an
event pool associated with it. An activity's event pool is initialized when
the activity is created, and deleted when the activity is deleted. Event-related
commands such as DEFINE INPUT EVENT and DEFINE COMPOSITE EVENT operate on
the event pool associated with the current activity.
- EX
- See exception response (EX, ER).
- exception
- An abnormal condition such as an
I/O error encountered in processing a data set or a file, or using any resource.
- exception class data
- CICS monitoring information on exception
conditions raised by a transaction, such as queuing for VSAM strings or waiting
for temporary storage. This data highlights possible problems in system operations.
- exception response (EX, ER)
- In SNA, a value in the form-of-response-requested
field of the request header that directs the receiver of the request to return
a response only if the request is unacceptable as received or if the request
cannot be processed; that is, only a negative response can be returned. See
also definite response (DR), no response.
- exception
trace entry
- An entry made to the internal trace table and any
other active trace destinations when CICS detects an exception condition.
It gives information about what was happening at the time the failure occurred
and what was being used.
- exchange lognames
- The process by
which, when an APPC connection is established between two CICS systems (or
reestablished after failure), the name of the system log currently in use
on each system is passed to the partner. The exchange lognames process affects
only synclevel 2 conversations. It is used to detect the situation where a
failed CICS has been communicating with a partner that is waiting to perform
session recovery, and is restarted using a different system log.
- EXCI
- See external CICS interface (EXCI).
- exclusive control
- A type of access
control in which VSAM keeps control of the control interval (CI) containing
a specific record until a REWRITE, UNLOCK, or DELETE command is issued for
that record. The purpose of exclusive control is to protect against simultaneous
update.
- exclusive intent
- In IMS, the scheduling intent type that prevents
an application program from being scheduled concurrently with another application
program.
- exclusive-key storage
- In MVS key-controlled storage protection,
storage with storage keys other than open-key.
- exclusive use
- A means
by which CICS and data managers, such as SQL/DS, combine to prevent concurrent
updates of resources. A transaction updating a recoverable resource gets control
of that resource until it terminates or indicates that it wants to commit
those changes with a syncpoint command. Other transactions requesting the
same resource must wait until the first transaction has finished with it.
- EXEC interface
- See application programming interface (API).
- EXEC
interface block (EIB)
- A control block associated with each task
in a CICS command-level environment. The EIB contains information that is
useful during the execution of an application program (such as the transaction
identifiers) and information that is helpful when a dump is being used to
debug a program.
- EXEC interface stub
- The stub link-edited
with every command-level program. It is part of the CALL interface between
EXEC CICS commands and the CICS EXEC interface program (EIP).
- execution diagnostic facility (EDF)
- A facility used for testing
application programs interactively online, without making any modifications
to the source program or to the program preparation procedure. The facility
intercepts execution of the program at various points and displays information
about the program at these points. Also displayed are any screens sent by
the user program, so that the programmer can converse with the application
program during testing just as a user would do on the production system.
- execution interface program (EIP)
- Converts high-level (command-level)
requests into the corresponding internal macro-level requests.
- execution key
- The MVS storage protection key in which CICS executes
a program. The execution key for a program can be CICS key (key 8) or user
key (key 9).
- exit point
- A specific point in a system function or program where
control may be passed to one or more specified exit programs.
- exit programming interface (XPI)
- Provides global user exit programs
with access to some CICS services. It consists of a set of function calls
that can be used in user exit programs to extend CICS functions.
- expiration time
- The time at which a time-controlled CICS function is to be started.
- extended addressing
- The use of 31-bit addresses (above the 16MB
line) which multiplies by 2 to the power of 7 the range of virtual storage
that can be addressed.
- extended binary-coded
decimal interchange code
- See EBCDIC.
- extended CICS dynamic
storage area (ECDSA)
- Storage area allocated above the 16MB line
for CICS code and control blocks that are eligible to reside above the 16MB
line but that are not eligible for the ERDSA (that is, they are not reentrant.)
See Putting applications above the 16mb limitfor
more information.
- extended common system area
(ECSA)
- A major element of MVS/ESA virtual storage above the 16MB
line. This area contains pageable system data areas that are addressable by
all active virtual storage address spaces. It duplicates the common system area (CSA) which
exists below the 16MB line.
- extended count-key-data
device (ECKD device)
- A disk storage device that has a data transfer
rate faster than some processors can utilize. A specialized channel program
is needed to convert ordinary CKD channel programs for use with an ECKD device.
- extended error queue element (EEQE)
- Data that describes an I/O
error on a local DL/I database. EEQEs are recorded by CICS in the global catalog.
CICS uses EEQEs to provide I/O error handling in XRF takeovers and in all
non-XRF restarts, including cold starts.
- extended link
pack area (ELPA)
- A major element of MVS/ESA virtual storage above
the 16MB line. It duplicates the link pack area (LPA). See Preparing to install CICS modules in the MVS link pack areafor more information.
See also extended addressing.
- extended private area
- An element of MVS/ESA virtual storage above the 16MB line. This area
duplicates the private area except for the 16KB system region area.
See CICS Private Areafor more information.
- extended read-only dynamic storage area (ERDSA)
- An area of storage
allocated above the 16MB line and used for eligible, reentrant CICS and user
application programs, which must be link-edited with the RENT and RMODE(ANY)
attributes. The storage is obtained in key 0, non-fetch-protected storage,
if the system initialization parameters include RENTPGM=PROTECT. If RENTPGM=NOPROTECT
is specified, the ERDSA is in CICS-key storage.
- Extended Recovery
Facility (XRF)
- A facility that increases the availability of CICS
transaction processing, as seen by the end users. Availability is improved
by having a second CICS system (the alternate system) ready to continue
processing the workload, if and when particular failures that disrupt user
services occur on the first system (the active system) .
- extended
restart (XRST)
- An IMS/ESA system service call that can request
that a program restarts normally or from a specific checkpoint ID, a time/date
stamp, or (BMPs only) the last checkpoint issued. Extended restart can be
requested by EXEC DLI commands or CALL DLI calls in a batch program or a BMP.
- extended shared dynamic storage area (ESDSA)
- The user-key storage
area for any non-reentrant user-key RMODE(ANY) programs, and also for any
storage obtained by programs issuing CICS GETMAIN commands for storage above
the 16MB boundary with the SHARED option. For more details about the DSALIM
and EDSALIM SIT parameters that control the overall limits of DSA and EDSA
storage, see Adjusting the limits for dynamic storage
areas. For more details of how the major elements of CICS and MVS storage
are related, see Storage requirements for a CICS region.
- extended system queue area (ESQA)
- A major element of MVS/ESA virtual
storage above the 16MB line. This storage area contains tables and queues
relating to the entire system. It duplicates above the 16MB line the system queue area (SQA). See MVS Storagefor more information.
- extended user dynamic storage area (EUDSA)
- Storage area allocated
above the 16MB line, used for data and for user application programs that
execute in user-key and are eligible to reside above the 16MB line, but that
are not eligible for the ERDSA (that is, not reentrant.)
- extensible markup language (XML)
- A standard metalanguage for defining
markup languages. XML uses tags to define the structure of data, leaving the
interpretation of the data to the application that reads it.
- extent
- A continuous
space on disk or diskette that is occupied by or reserved for a particular
data set, data space, or file.
- external call interface
(ECI)
- An application programming interface that allows a non-CICS
program running on a client to call a CICS program located on a CICS server.
Data is exchanged in the COMMAREA as for normal CICS interprogram communication.
- external CICS interface (EXCI)
- A CICS application programming
interface that helps to make CICS applications more easily accessible from
non-CICS environments. It enables a non-CICS program (a client program) running
in MVS to call a program (a server program) running in a CICS Transaction
Server region and to pass and receive data by means of a communications area.
The CICS program is invoked as if linked-to by another CICS program. For programming
information about EXCI, see The EXCI User-replaceable
module
- external presentation interface
(EPI)
- An application programming interface that allows a non-CICS
client program to appear to a CICS server as one or more standard 3270 terminals.
This enables the client to access, for example, CICS on System/390 transactions
written for 3270 terminals, without needing to change the System/390 code.
See also CICS Clients
- external response time
- Elapsed time from pressing the ENTER key or another AID key until the
action requested by the terminal user is completed, and the next entry can
be started. Elapsed time between the end of an enquiry or demand on a computer
system and the beginning of the response.
- external security
manager (ESM)
- A security product that performs security checking
on users and resources. RACF is an example of an ESM.
- external throughput rate (ETR)
- The amount of useful work completed
in a unit of time (for example, the number of transactions completed per elapsed
second).
- extrapartition transient data
- A CICS facility for temporarily
saving data in the form of queues, called destinations. See also intrapartition transient data (TD).
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