I

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).
[[ Contents Previous Page | Next Page Index ]]