- ICCF
- See Interactive Computing and Control Facility (ICCF).
- ICE
- See interval control element (ICE).
- ICF
- See integrated catalog facility (ICF).
- ICP
- See interval control program (ICP).
- IDCAMS
- An IBM
program that is used to process access method services commands. It can be
invoked as a job or job step, from a TSO terminal or from within a user's
application program.
- IDL
- See Interface Definition Language (IDL).
- IDL mangled
- Pertaining to Java names that are altered or "mangled" so that they
can be mapped to equivalent IDL names. When a Java name contains characters
that are not permitted in IDL names, these characters are removed and the
remaining characters are used to form the IDL name. For detailed information
about how Java names are mapped to IDL names, see the OMG Java to IDL mapping,
published by the Object Management Group (OMG), and available from www.omg.org.
- IDUMP
- See system dump (IDUMP).
- IIOP
- See Internet Inter-ORB protocol.
- IIOP connection
- A TCP/IP connection to an IIOP server. Requests
enter the server via inbound IIOP connections and flow to other servers via
outbound IIOP connections.
- image copy
- A backup copy of a data set,
used to restore the data set if necessary after a failure.
- immediate
disconnection
- An option for disconnecting CICS from DBCTL, using
the CDBC transaction. Immediate disconnection allows only current DL/I requests
to DBCTL from this CICS system to be completed before CICS is disconnected
from DBCTL. See also orderly disconnection.
- immediate shutdown
- A shutdown of CICS in which tasks in progress are not allowed to complete
normally. This form of shutdown is requested from the master terminal.
- IMS
- See Information Management System (IMS).
- IMS monitor
- An IMS monitoring
tool, which can be run online.
- IMS Resource Lock
Manager (IRLM)
- An IMS global lock manager that resides in its
own address space. IRLM is required for block-level database sharing, either
under DBCTL control or in an IMS data sharing environment.
- inbound
- In FEPI and CICS, data received by a program from elsewhere.
- index
- (1) A set of pointers that are logically ordered by the values of
a key. Indexes provide quick access to data and can enforce uniqueness on
the rows in the table. When you request an index, the database manager builds
the structure and maintains it automatically. The index is used by the database
manager to improve performance and ensure uniqueness.
- (2) A table
containing the key value and location of each record in an indexed file.
- indexed sequential access method (ISAM)
- An access method that
can be used for either direct or sequential update or retrieval. An index
is stored on DASD with the data set.
- index record
- A system-created
collection of VSAM index entries that are in collating sequence by the key
in each of the entries.
- indirect destination
- In CICS,
a type of transient data destination that points to another destination within
the destination control table, rather than directly to a queue. Indirect
destinations allow you to refer to a single real destination by more than
one name.
- in-doubt
- In CICS, the state at a particular point in a distributed
UOW for which a two-phase commit syncpoint is in progress. The distributed
UOW is said to be in-doubt when a subordinate recovery manager (or transaction
manager) has replied (voted) in response to a PREPARE request, and has written
a log record of its response to signify that it has entered the in-doubt state,
and does not yet know the decision of its coordinator (to commit or to back
out). See also subordinate, two-phase commit.
- in-doubt window
- The period between the sending of a syncpoint request to a remote
system and the receiving of a reply. During this period, the local system
does not know whether or not the remote system has committed its changes.
If processing fails in the in-doubt window, recovery processing must resolve
the status of any work that is in-doubt.
- in-doubt window resolution utility program
- A utility you can use
to help determine the resources that have been changed by transactions using
ISC or MRO for tasks that are considered to have been in-doubt after a CICS
region failure. For more details, see the CICS Transaction Server Operations
and Utilities Guide.
- in-flight
- The state of a resource or unit
of recovery that has not yet completed the prepare phase of the commit process.
- in-flight task
- (1) A task that is in progress when a CICS system failure
or immediate shutdown occurs.
- (2) During emergency restart, a task
that caused records to be written to the system log, but for which no syncpoint
record has been found for the current LUW. This task was interrupted before
the LUW completed.
- Info/Analysis
- A VSE/ESA diagnostic
tool that can manage and process system dumps. See the VSE/ESA Diagnosis
Tools manual.
- information display panel
- The panel that supports the CICSPlex
SM window environment. It consists of a control area and a display area. CICSPlex
SM views are displayed in windows within the display area of this panel.
- information display parameters
- A CICSPlex SM user profile option
that defines the initial screen configuration, how frequently the screen will
be updated by ASU, and how a window will wait for command processing to complete
before timing out.
- Information Management System
(IMS)
- Any of several system environments available with Database
Manager and Transaction Manager, capable of managing complex databases and
terminal networks.
- Information/System (INFO/SYS)
- A consolidated collection of IBM technical data of interest to data
processing personnel responsible for planning, installing, and tuning IBM
systems and subsystems.
- initial data
- A type
of inbound data that arrives when a new session is bound. This is commonly
called a "good morning" message.
- initialization
- Actions
performed by the CICS system to construct the environment in the CICS region
to enable CICS applications to be run. The stage of the XRF process when the
active or the alternate CICS system is started, signs on to the control data
set, and begins to issue its surveillance signal.
- initial
program load (IPL)
- The process of loading system programs and
preparing a system to run applications.
- initiator
- In a two-phase
commit syncpointing sequence (LU6.2 or MRO), the task that initiates syncpoint
activity. See also agent.
- input event
- An atomic
event that can be sent to an activity by its parent, or from outside the process.
It tells the activity why it has been activated. See also system event.
- input/output (I/O)
- Pertaining to a device, process, or channel
involved in data input, data output, or both.
- input/output PCB
(I/O PCB)
- Program communication block needed to issue DBCTL service
requests.
- input partition
- In BMS, a partition holding input required by
the logic of the program and nominated in the associated RECEIVE MAP command.
See partition.
- inquiry
- A request for information from storage
- installation
- (1) A particular computing system, including the work
it does and the people who manage it, operate it, apply it to problems, service
it, and use the results it produces.
- (2) The procedure of adding a
program or program option to the mass storage medium of the computer, making
the program runnable, and ensuring that the program interacts properly with
all other affected programs in the system.
- installation
verification procedure (IVP)
- A program or programs that are run
at the end of installation of an IBM licensed program, in order to verify
that the program is working correctly.
- integrated
catalog facility (ICF)
- A component that provides integrated
catalog facility catalogs. See also integrated catalog facility catalog.
- integrated catalog facility catalog
- A catalog that consists of
a basic catalog structure, which contains information about VSAM and non-VSAM
data sets, and at least one VSAM volume data set, which contains data about
VSAM data sets only.
- integrated services
digital network (ISDN)
- A CCITT Recommendation that defines an
interface to a network that can carry voice, data, and image over the same
communications line.
- integrity
- The quality of data that exists
as long as destruction, alteration, loss of consistency, or loss of data are
prevented.
- intent scheduling
- In IMS or SQL/DS, ensuring that a particular
segment type of a database is accessible for potential update by only one
task at a time.
- interactive
- Pertaining to a program or
system that alternately accepts input and then responds. An interactive system
is conversational, that is, a continuous dialog exists between user and system.
- Interactive Computing and Control Facility (ICCF)
- An IBM licensed
program for use at VSE installations. Through VSE/ICCF, the services of a
VSE-controlled computing system become available, on a time-sliced basis,
to authorized users of terminals that are linked to the system's central processor.
- interactive interface
- A system facility which controls how different
users see and work with the system by means of user profiles. When signing
on, the interactive interface makes available those parts of the system authorized
by the profile. The interactive interface has sets of selection-and data-entry
panels through which users communicate with the system.
- Interactive Problem Control System (IPCS)
- An MVS component that
provides online problem diagnosis and reporting. A CICS IPCS exit enables
the formatting of an MVS system dump.
- Interactive System Productivity Facility (ISPF)
- An IBM licensed
program that serves as a full-screen editor and dialogue manager. Used for
writing application programs, it provides a means of generating standard screen
panels and interactive dialogues between the application programmer and terminal
user.
- interchange code
- An accepted convention for computer character
representation. An interchange code typically defines several code pages.
EBCDIC and ASCII are interchange codes. See code page.
- intercommunication
- In CICS, a term embracing intersystem communication
(ISC) and multiregion operation (MRO).
- Interface
Definition Language (IDL)
- In CORBA, a declarative language that
is used to describe object interfaces, without regard to object implementation.
- interlock
- See deadlock.
- intermediate
routing node
- A subarea node, that can receive and route sessions
that neither originate in nor are destined for network addressable units in
that subarea node. Terminals attached to an IRN cannot have XRF backup sessions.
- internal lock
- A mechanism used by CICS to protect individual resource
definitions against concurrent updates.
- internal resource
lock manager
- A global lock manager that resides in its own address
space, and gives the option of keeping most of its control blocks in local
storage instead of in the common storage area (CSA). You must used the IRLM
to maintain data integrity if you are sharing databases at block level.
- internal response time
- Elapsed time from the message to start
a transaction being received by CICS until the time that the transaction ends.
- internal throughput rate (ITR)
- The number of completed transactions
per processor-busy second. (Processor busy seconds can be calculated by multiplying
elapsed seconds by the processor utilization percentage).
- internal trace
- A CICS trace facility that is present in virtual storage. When
CICS detects an exception condition, an entry always goes to the internal
trace table, even if you have turned tracing off.
- International Organization for Standardization (ISO)
- An international
body that promotes the development of standards that facilitate international
exchange of goods and services, and that encourages cooperation in technological
activity. A notable example of such a standard is the Open Systems Interconnection
(OSI) model, a standard for network architecture. ISO members are designated
standards organizations of participating nations.
- International Telecommunication Union Telecommunication Standardization Sector
(ITU-T)
- The part of the International Telecommunication Union
(ITU) that is responsible for developing recommendations for telecommunications.
Formerly called the CCITT, this international agency is responsible for making
technical recommendations about telephone and data (including fax) communications
systems for Post, Telephone and Telegraph (PTT) administrations and suppliers.
- Internet Inter-ORB Protocol (IIOP)
- A protocol used for communication
between Common Object Request Broker Architecture (CORBA) object request brokers.
- interregion communication (IRC)
- The method by which CICS provides
communication between a CICS region and another region in the same processor.
Used for multiregion operation (MRO) . See also intersystem communication (ISC).
- intersystem communication (ISC)
- A CICS facility that provides
inbound and outbound support for communication from other computer systems.
See also interregion communication (IRC), multiregion operation (MRO).
- inter-transaction
affinity
- A relationship between a set of transactions that share
a common resource and coordinate their processing. Transaction affinity between
two or more CICS transactions is caused by the transactions using techniques
to pass information between one another, or to synchronize activity between
one another, in a way that requires the transactions to execute in the same
CICS region.
- interval control element (ICE)
- An entry under CICS interval control
that is waiting in an unexpired state. Its defined date and time (to become
current) are in the future. When an ICE expires it becomes an automatic initiation
descriptor (AID).
- interval control program (ICP)
- The CICS program that provides time-dependent facilities. Together with
task control, interval control (sometimes called time management) provides
various optional task functions (such as system stall detection, runaway task
control, and task synchronization) based on specified intervals of time, or
the time of day.
- interval statistics
- In CICS Transaction
Server only, CICS statistics gathered at user-specified intervals and written
to the SMF data set. See also end-of-day statistics, requested statistics, requested reset statistics, and unsolicited statistics.
- intrapartition
transient data (TD)
- A CICS facility for temporarily saving data
in the form of queues, called destinations. See also extrapartition transient data.
- I/O
- See input/output (I/O).
- I/O PCB
- Seeinput/output PCB (I/O PCB).
- IPCS
- See Interactive Problem Control System (IPCS).
- IPL
- See initial program load (IPL).
- IRC
- See interregion communication (IRC).
- IRLM
- See Internal resource lock manager
- ISAM
- See indexed sequential access method (ISAM).
- ISC
- See intersystem communication (ISC).
- ISDN
- See integrated services digital network (ISDN).
- ISO
- See International Organization for Standardization.
- isolation
- Even though transactions execute concurrently, they
appear to be serialized. In other words, it appears to each transaction that
any other transaction executed either before it, or after it. See also ACID properties.
- ISPF
- See interactive system productivity facility (ISPF).
- ITR
- See internal throughput rate (ITR).
- ITU-T
- See International Telecommunication Union Telecommunication Standardization Sector (ITU-T).
- IVP
- See installation verification procedure (IVP).
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