CICS domains

A description of the domains into which CICS® is organized, and the functions within these domains.

CICS domains
At the top level, CICS is organized into domains. With the exception of the application domain, which contains several components, each domain is a single major component of CICS.
Asynchronous services domain (AS)
The asynchronous services domain provides the functions within asynchronous APIs to attach asynchronous child tasks, and then get responses back from the child tasks.
Application manager domain (AP)
Business application manager domain (BA)
The business application manager domain (also sometimes known as business application manager) is responsible for managing CICS business transaction services (BTS) processes, process types and activities. It deals with the hardening of the associated data to BTS repository files. Along with scheduler services domain and event manager domain it forms the CICS BTS function.
CICS catalog domain (CC)
The catalog domain manages the global and local catalog.
Directory manager domain (DD)
The directory manager domain manages directories of named tokens.
Document handler domain (DH)
The document handler domain manages CICS Documents.
Domain manager domain (DM)
The domain manager domain maintains permanent information about other domains.
Debugging profile domain (DP)
The Debugging profile domain manages debugging profiles.
Dispatcher domain (DS)
The dispatcher domain is concerned with the attaching, running, and detaching of tasks, and the posting of TCBs.
Dump Domain (DU)
The dump domain is responsible for producing storage dumps and for handling the associated data sets and status.
Enterprise Java domain (EJ)
The Enterprise Java™ domain provides support for Web Services Atomic Transactions (WS-AT) only.
Event manager domain (EM)
The event manager domain manages event and timer objects created within CICS BTS activities.
Event processing domain (EP)
The Event processing domain manages events captured as a result of an installed event binding.
IP ECI (IE) domain
The IP ECI domain provides services that are used by the CICS EPI protocol over IP connections.
Inter-system (IS) domain
The IS domain manages the resources, and the sending and receiving of requests and responses for IP interconnectivity (IPIC) connections.
Kernel domain (KE)
The kernel domain provides a consistent linkage and recovery environment for CICS.
Loader domain (LD)
The loader domain is used to obtain access to storage-resident copies of nucleus and application programs, maps, and tables. The loader domain uses the operating system interfaces to load programs into the CICS dynamic storage areas (DSAs), and to scan the link pack area (LPA).
Log manager domain (LG)
The log manager domain (also sometimes known as "log manager" or "logger") provides facilities for Recovery Manager to write records to the CICS system log, read records from the CICS system log, and maintain the system log deleting obsolete records and shunting old, but still needed, records to a secondary system log.
Lock manager domain (LM)
The lock manager domain provides locking and associated queuing facilities for CICS resources. Before using these facilities, a resource must add a named lock for itself. This lock can then be requested as either exclusive or shared. If an exclusive lock is obtained, no other task may obtain the lock with that name; if a shared lock is obtained, multiple tasks may obtain that lock, and the exclusive lock with that name cannot be acquired.
Message domain (ME)
The message domain acts as a repository for CICS messages, and handles the sending of messages to transient data destinations or to the console. It also provides an interface for returning the text of a message to the caller.
Markup language domain (ML)
The Markup language domain (ML) processes markup languages.
Monitoring domain (MN)
The monitoring domain is responsible for all monitoring functions within CICS. These functions enable the user to measure the amount of CPU, storage, temporary-storage requests, and so on used per task, and hence charge customers for computing services and help review the performance of a CICS system.
Managed platform (MP) domain
The managed platform domain manages policies.
Enqueue domain (NQ)
The NQ domain provides UOW based locking services. This is provided to the local clients FC, TD and TS. It also services the ENQ and DEQ application programming commands.
Object transaction service domain (OT)
The object transaction service domain provides services to manage OTS transactions.
Parameter manager domain (PA)
The parameter manager domain informs CICS domains of system parameters during CICS initialization. These system initialization parameters are specified in the system initialization table (SIT), and as temporary override parameters read from the SYSIN data stream or specified interactively at the system console.
Program manager domain (PG)
The program manager domain provides a variety of functions for managing programs in CICS.
Pipeline manager domain (PI)
The pipeline manager domain manages the processing of SOAP messages in a CICS pipeline.
Partner management domain (PT)
The partner domain provides services to coordinate flows between two CICS tasks.
Resource life-cycle domain (RL)
The resource life-cycle domain handles the installation and life cycle of application resources.
Recovery manager domain (RM)
The Recovery manager (RM) domain is responsible for ensuring that the resource updates for a unit of work are all committed or all backed out, including updates across multiple systems.
Region status domain (RS)
The region status (RS) domain captures information about the status of a region and records the status in a coupling facility data table (CFDT). Using RS domain services, other CICS regions can enquire on this status, by reading the CFDT record.
RRMS domain (RX)
The RRMS domain is responsible for managing interaction with z/OS® Recoverable Resource Management Services (RRMS) and in particular, Resource Recovery Services (RRS) which is a component of RRMS.
Request streams domain (RZ)
The request streams domain provides context switching facilities. The domain allows a running task to block while a new task is started, potentially under a different user ID or transaction. When the new task ends, control returns to the original task. For example, the RZ domain is used by web services when a provider mode application runs under a different user ID from the pipeline that attached it.
Scheduler services domain (SH)
The scheduler services domain is used to harden schedule requests between the end of one unit of work and the start of the next, and to route schedule requests to a target region identified by the distributed routing exit program. A schedule request is a request to undertake a piece of work, or execute a named transaction. The domain is used by CICS business transaction services.
JVM domain (SJ)
The JVM domain provides services that are used by Java virtual machines in the CICS environment.
Storage manager domain (SM)
The storage manager domain manages virtual storage requests.
Sockets domain (SO)
The sockets domain provides TCP/IP services to CICS. It includes a TCP/IP listener system task, the TCPIPSERVICE resource to manage the listener, and domain gates to operate on a TCP/IP connection.
Statistics domain (ST)
The statistics domain controls the collection of resource statistics for a CICS system (the monitoring domain collects task statistics). The statistics domain collects data at user-specified intervals, at system quiesce or logical end of day, and when requested by the user, and writes it to the statistics data sets in SMF format. This can subsequently be used by the statistics offline utility to produce formatted reports.
Timer domain (TI)
The timer domain provides interval timing and alarm clock services for CICS domains. These are processes that cause an action to occur at some predetermined future time. This service (called "notifying") can be performed after a specific interval, at periodic intervals, at a specified time of day, or at a specific time of day every day.
Trace domain (TR)
The trace domain is used by CICS system code and user application programs to record details of the sequence of events occurring in the system. The basic unit of information created for this purpose is called a trace entry.
Temporary storage domain (TS domain)
The temporary storage domain manages requests for temporary storage to be used by CICS or user applications.
User domain (US)
The user domain manages CICS users and their security attributes.
Web domain (WB)
The web domain manages interaction between CICS and web clients, or between CICS as an HTTP client and servers on the Internet, with the exception of Atom feeds, which are managed by the Web 2.0 (W2) domain.
Web 2.0 domain (W2)
The Web 2.0 domain manages Atom feeds that CICS serves to web clients. The other actions of CICS as an HTTP server and as an HTTP client are managed by the web (WB) domain.
Transaction manager domain (XM)
The transaction manager domain (also sometimes known as "transaction manager") provides transaction-related services.
Security domain (XS)
The security domain manages the security of CICS resources and the interaction with the security manager.