Mainframe glossary
407 terms and acronyms, each explained in a sentence or two.
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A
- Abend
- Access level
- ACCESS MODE
- Access path
- ACS routine
- Active/active
- Address space
- ADRDSSU (DFSMSdss)
- AEI0 / AEIx
- AI provenance
- AI usage policy
- Alias
- Alternate index (AIX)
- APCT
- APF (Authorized Program Facility)
- API gateway
- Approved AI tool
- ASRA
- AT-TLS (Application Transparent TLS)
- Audit trail
- AutoSys (AutoSys Workload Automation)
B
- Back-out plan
- Base register
- BASED storage
- Batch
- Batch window
- Bind / link-edit
- BLDINDEX
- BMP (batch message processing)
- BMS (map screen)
- BPXBATCH
- Buffer pool
- Build pipeline
- Business impact analysis (BIA)
C
- CAB
- CALL
- Call graph
- Capacity planning
- Catalog
- CATLG
- CEEDUMP
- CEMT
- Certification
- Change data capture (CDC) (CDC)
- Change freeze
- Change management
- Channel and containers
- Characterization test
- Chargeback
- Checkpoint / restart record
- chtag
- CI / CA split
- CI/CD for mainframe
- CICS
- CICS region
- CICS web services
- CICSPlex SM
- Classification rules
- CLIST
- Cluster
- Cluster ratio
- COBOL
- Code page
- COMMAREA
- COMMIT
- COMP-3 (packed decimal) (packed decimal)
- Compile
- Completion code
- Concatenation
- COND
- Condition code (CC)
- Consistency group
- Control interval (CI)
- Control statement
- Control-M
- Copybook
- Couple data set (CDS)
- Coupling facility (CF) (CF)
- CPC / CEC (central processor complex)
- Critical path
- CSD (CICS system definition file)
- CSI (consolidated software inventory) (CSI)
D
- DASD (disk, 3390)
- Data lineage
- Data masking
- Data set list (3.4)
- Data sharing
- Data virtualization
- Dataset
- DB2 catalog
- DB2 for z/OS
- DBD (database description)
- DBRM
- DD statement (ddname data definition)
- Dead code
- Dead-letter queue (DLQ) (DLQ)
- Deadlock (-911)
- DEFINE CLUSTER
- Defined capacity (soft capping)
- Dependency Based Build (DBB)
- DFH messages
- DFSMShsm (HSM)
- DFSMSrmm (RMM)
- DFSORT / SORT
- DISP
- Distributed trace
- DL/I (Data Language One)
- DR automation
- DSECT
- DSN
- DSNTIAR
- Dynamic Workload Console (DWC)
E
F
G
- GDG (generation data group)
- GDPS (Geographically Dispersed Parallel Sysplex)
- Git on z/OS
- GnuCOBOL
- Golden output (Baseline output)
- Golden signals
H
I
- IBM MQ (MQSeries, WebSphere MQ)
- IBM Workload Scheduler (IWS) (TWS, Maestro)
- IBM Z Open Editor
- IBM Z Workload Scheduler (TWSz) (TWSz, OPC, IZWS)
- ICETOOL
- ICH408I
- iconv
- ICSF
- IDCAMS
- Idempotent
- Identity propagation
- IEBCOMPR
- IEBCOPY
- IEBGENER
- IEFBR14
- IEHLIST
- IFASMFDP / IFASMFDL
- IFL (Integrated Facility for Linux)
- IKJEFT01
- Image copy
- Impact analysis
- Importance (WLM)
- IMS (Information Management System)
- IMS status code
- Incident
- INITIALIZE
- Initiator
- Integration governance
- Isolation level
- ISPF
- ISPF editor
J
- JCL (job control language)
- JES (Job Entry Subsystem)
- JES2 (job entry subsystem jes3)
- JES2 command
- JESJCL
- JESMSGLG
- JESSPOOL
- JESYSMSG
- JIL (Job Information Language)
- Job class
- JOB statement
- JSON
- JSON GENERATE / JSON PARSE
K
L
- Language Environment (LE) (LE)
- Least privilege
- Level number
- Line command
- LINK
- LINKAGE SECTION
- LinuxONE
- LISTCAT
- LNKLST (link list, LNKLST concatenation)
- Load module
- Lock escalation
- Logon
- LPAR (logical partition)
- LRECL
M
- Mainframe
- Mainframe interview
- Mainframe roles
- Management class
- Mapset
- Member
- Modernisation
- Modernization backlog
- Modernization strategy
- MOVE
- MPP (message processing program)
- MQ channel
- MQ reason code (MQRC)
- MQI (Message Queue Interface) (Message Queue Interface)
- MRO (multiregion operation)
- MSU
- MTTR
- Multi-access spool (MAS)
- Multi-factor authentication
N
O
P
- Package
- Panel
- PARM
- PARMLIB (SYS1.PARMLIB)
- Password phrase
- PATH= on a DD
- PCB (program communication block)
- PDS (partitioned dataset library)
- PDSE
- PERFORM
- Performance index (PI) (PI)
- Persistent message
- Pervasive encryption
- PF key (function key)
- PICTURE (PIC)
- PL/I (PL/1)
- Plan
- Policy Agent (PAGENT)
- Portfolio
- Post-incident review
- PR/SM (PRSM)
- Predecessor / successor
- Primary command
- Privileged access
- Problem management
- PROC (procedure)
- PROCLIB
- Production support
- Prompt pattern
- PSB (program specification block)
- Pseudo-conversational
- PSW (Program Status Word)
- Pull request (Merge request)
Q
R
- RACF (acf2 top secret esm)
- READ … UPDATE
- RECFM
- Reorganisation
- REPRO
- Rerun
- RESP / DFHRESP
- REST API on z/OS
- Restart
- Retrieval-augmented generation (RAG) (RAG)
- Return code (rc cond code)
- REXX (Restructured Extended Executor)
- RLS (record-level sharing)
- RMF (Resource Measurement Facility)
- RMF Postprocessor
- ROLLBACK
- Rolling four-hour average (R4HA)
- Rolling maintenance
- Root cause
- RPO (recovery point objective)
- RRDS
- RSU (Recommended Service Upgrade) (RSU)
- RTO (recovery time objective)
- Runbook
- RUNSTATS
S
- S013
- S0C4
- S0C7
- s390x
- S806
- S822
- SAF (System Authorization Facility)
- Save area
- SB37 / SD37 / SE37
- Scheduler
- SCRT
- SDSF
- SEARCH
- Security class
- Security profile
- Segment (IMS)
- Segregation of duties
- Sequential dataset (PS) (qsam flat file)
- Server Time Protocol (STP) (STP)
- Service class
- Severity level
- SHAREOPTIONS
- Short-on-storage (SOS)
- Single point of failure (SPOF) (SPOF)
- SLA
- SMF (System Management Facilities)
- SMF log stream
- SMF type 80
- SMFPRMxx
- SMP/E (SMP/E)
- SMS (DFSMS) (DFSMS, system-managed storage)
- SPACE
- Split screen
- Spool
- SPUFI
- SQLCA
- SQLCODE
- SQLSTATE
- SRB (Service Request Block)
- SSRANGE
- STARTBR / READNEXT / ENDBR
- Started task (STC)
- Stem variable
- STEPLIB
- Stonebranch UAC (Universal Automation Center)
- Storage group (SMS)
- Strangler-fig pattern
- Stream I/O
- Subsystem
- SuperC
- SURROGAT
- Symbolic parameter
- SYNCPOINT
- SYSMOD
- SYSOUT
- Sysplex
- Sysplex Distributor
- System of record
- Systems programmer
T
- Table space
- Task
- TCB (Task Control Block)
- TCP/IP stack (z/OS)
- Temporary storage (TS queue)
- Threadsafe
- TN3270 server
- Transaction
- Transaction class (TRANCLASS)
- Transmission queue (XMITQ)
- Triage
- TRUNC compiler option
- TSO (time sharing option)
- TYPRUN
U
- UACC
- Unit of work (uow logical unit of work)
- Unix System Services (omvs zos unix)
- USAGE DISPLAY
- User catalog
- Userid segment
V
- VIPA (DVIPA)
- Virtual tape
- VSAM (virtual storage access method)
- VTAM
W
X
Z
- z/OS
- z/OS Connect
- z/OS-aware IDE
- z/OSMF (z/OS Management Facility)
- z/VM
- zFS (hfs file system)
- zIIP
- Zoned decimal
- Zowe
- Zowe CLI
- Zowe Explorer
- Zowe team configuration (zowe.config.json)
- zUnit