IMS Control Block Table (CBT) Pools
The IMS CBT storage manager (also known as the DFSBCB storage manager) manages pools of fixed-length control blocks.
All CBT pools can be displayed by issuing the /DISPLAY POOL CBT. Issuing the /DISPLAY POOL command with other keywords, such as DBB, DCC, DEP, DISP, FP, GEN, OSAM, SUM, and others, limits the display of the CBT pools to those related to the functional area of IMS that the keyword represents.
All of the CBT pools are briefly described in the following alphabetical list.
- AAB
- Obsolete CBT entry
- ADSC
- Fast Path area data set control block
- AESL
- Fast Path DEDB ADS list
- AHDR
- ETO autologon LU header/ autologon hash table synonym
- APST
- Partition specification table - above the line
- ATPW
- Attach catalog PSB work area block
- AWE
- Asynchronous work element
- BCPT
- Checkpoint id table
- BQEL
- ISAM/OSAM/VSAM buffer queue element
- BXQE
- BCB queue elements for use by DFSBCBxx modules only
- CATR
- IMS catalog request block
- CBLK
- Used in place of message queue to keep track of CPI-C scheduling requests
- CCB
- Conversational control block
- CFEZ
- Block used to store local parms for DC trace re-entrancy
- CLLE
- Common latch list element
- CM24
- Common work unit, 24-bit
- CMWU
- Common work unit
- CRSP
- OM command response block
- CSAG
- Callable services anchor block (CSAB) - global storage
- CSAL
- Callable services anchor block (CSAB) - local stoarge
- CSWA
- Common system work area - global storage
- CTBW
- Communication terminal block work area
- CULE
- Common use list element
- D1WA
- Dispatcher work area 1
- DACT
- DL/I call accounting block
- DBBD
- Database (DDIR) descriptor
- DBPB
- Data base purge block
- DBRC
- DBRC work area
- DCM
- Obsolete CBT entry
- DDIR
- DMB directory entry
- DDRE
- DMB directory extension
- DESC
- LU 6.2 descriptor block
- DG2W
- Global dispatcher area
- DL2W
- Local dispatcher area
- DLWA
- DL/I private work area
- DMAC
- Fast Path DEDB area control block for dynamic areas
- DMHR
- Fast Path VSO dynamic DHMRs for write staging area
- DPST
- Dependent region PST
- DPXB
- Dispatcher extension block
- DSME
- Fast Path data space mapping entry
- DSML
- Fast Path data space mapping list
- EMAC
- Obsolete CBT entry
- EPST
- Fast Path extended PST
- EQEL
- Resolve indoubt structure queue element
- EZS
- External connection status element
- FEIB
- Front end message switch interface block
- FMMC
- Fast Path control block to contain VSAM extents
- FNCB
- Fast Path notify control block
- FPB6
- Fast Path DBFBPND6 block for FP 64-bit buffer pools
- FPCP
- Fast Path command parameter list
- FSRB
- Fast Path SRB
- GDS
- Obsolete CBT entry
- GESE
- Global external subsystem entry
- GIOB
- Global IOSB
- GOWA
- Global OSWA
- GPNT
- Fast Path global name table
- GQMW
- Global queue manager work area
- GSAV
- Global save area
- HSHE
- Hash table element header
- HSHS
- Hash table slot header
- HTEB
- BPE LFS hash table services: hash table element block, CTL private
- HTED
- BPE LFS hash table services: hash table element block, DLI private
- IAFP
- IAFP dataset control block
- IBKD
- Interface Block for user exit services in DL/I region private storage. The IBKC control block is used for working storage and a parameter list when invoking a user exit through IMS DFSUSRX user exit service.
- IBKP
- Interface Block for user exit services in control region private storage. The IBKP control block is used for working storage and a parameter list when invoking a user exit through IMS DFSUSRX user exit service.
- IDT
- Identify table entry
- IEQE
- Inflight/indoubt data buffers
- IOSB
- I/O supervisor block
- IPST
- System PST in DLI/SAS private, 31-bit storage
- IRLM
- IRLM parameter area
- KLSD
- LSO dependent control block
- L56X
- Fast Path DBCTL log record
- LCLL
- Local common latch list element (local storage)
- LCRE
- Local current recovery entry
- LG24
- An LSAV below the 16m line
- LGND
- Logon descriptor control block sets
- LGWA
- Log work area
- LGWX
- Log work area extension (private)
- LPNT
- Fast Path local name table
- LPST
- Local PST block
- LQB
- Local queue block
- LQMW
- Local queue manager work area
- LRA
- Obsolete CBT entry
- LS24
- 24-bit quick block, local save area / AWE
- LSAV
- Local save area
- LSWA
- Local system work area
- LUB
- LUB pool below 16 MB line for LU 6.2
- LXB
- Dynamic link extension block for VTAM® and TCP/IP links. The LXB control block is mapped by the LXB copy.
- MMCL
- OSAM Media Manager Interface module parameter list.
- MMPL
- Media Manager Services parameter list.
- MMRQ
- Media Manager Request Element prefix plus Media Manager Request Element.
- MPB
- Obsolete CBT entry
- MPCB
- PCB block for MSC bandwidth. The MPCB control block is mapped by the DFSMSPCB macro.
- MSCL
- MSC logical link control blocks: LLB, two LTBs, and a CRB. The MSCL control block is mapped by the DFSMSCL macro.
- MSCP
- MSC physical link control blocks: LCB and CTT. The MSCP control block is mapped by the DFSMSCP macro.
- MSEB
- Work area for the TM and MSC Message Routing and Control User exit routine (DFSMSCE0). The MSEB work area is mapped by the DFSMSCEB macro.
- MSGP
- Message pool
- MUTE
- OTMA MCB user table entry
- OCMD
- OM command instance block
- OFB
- Obsolete CBT entry
- OLRK
- OLR KSDS update entry
- OSSA
- OSAM save area block.
- OSWA
- OSAM work area (IOMA)
- OTDD
- OTMA destination descriptors
- OTMD
- OTMA member descriptors
- PCIB
- Partition CIB
- PDEX
- Partition directory extension
- PDIR
- PSB directory entry
- PF62
- Message prefix block for LU 6.2
- PFQE
- CQSPUT failure queue element
- PGMD
- Program (PDIR) descriptor
- PST
- Partition specification table
- QAB
- QAB pool for LU 6.2
- QLST
- Work area to hold queue manager parameter list
- QLTC
- DEDB and area quiesce latch blocks for DEDB Alter
- QMBA
- Queue manager buffer area (large message)
- QMBS
- Queue manager buffer area (small message)
- QQSN
- Queue space notification area
- QS24
- Temporary save area set with parm areas - 24-bit storage
- QSAV
- Temporary save area set with parm areas - 31-bit storage
- RACW
- RACF® work area used for racinit, fracheck, etc.
- RBAT
- Fast Path VSO RBA update table entries
- RCNT
- Remote communication name table. The RCNT control block is mapped by the RCNT copy.
- RCTD
- Fast Path routing code (RCTE) descriptor
- RCTE
- Fast Path routing code table entry
- RECA
- VTAM receive any buffer
- RPST
- Restart partition specification table
- RRE
- Residual recovery entry
- RSCX
- Resource extension block
- SAA
- Obsolete CBT entry
- SAP
- Save area prefix
- SIDX
- Subsystem index entry
- SLOG
- DC monitor work area
- SMB
- Scheduler message block
- SOPB
- Sign-on parameter block
- SPQX
- SPQB extension block
- SQOF
- Shared queues overflow hash table element
- SRA
- Obsolete CBT entry
- SRBC
- Common SRB pool
- STAT
- DBCTL and DRA statistics area
- STB
- Obsolete CBT entry
- STTR
- DL/I trace stacks
- SVPG
- System service parameter lists - global
- SVPL
- System service parameter lists - local
- TCBT
- TCB table
- TDBC
- Obsolete CBT entry
- TDCB
- Obsolete CBT entry
- TIB
- TIB pool for LU 6.2
- TLS
- Transaction level statistics area
- TPIP
- TPIPE pool for OTMA
- TRND
- Transaction (SMB) descriptor
- TT24
- Trace table (24-bit storage)
- TT3P
- Trace table (31-bit, private storage)
- TTAB
- Trace table (31-bit storage)
- UOWE
- Unit of work table entry
- USRD
- User descriptor control blocks
- USTB
- Obsolete CBT entry
- UXIC
- User exit instance (common)
- UXIP
- User exit instance (private)
- UXSC
- User exit static area (common)
- UXSP
- User exit static area (private)
- VRPL
- VSAM RPL/save area stack
- VTCB
- VTAM session control block
- VWA
- Volatile work area
- WLMB
- Work area of parameter list for the Workload Manager classification service.
- X124
- DL/I pool below 16m line
- XMCI
- Cross memory itask block
- XMCL
- Local XMCI block (ctl private)
- XPST
- Extended PST area (dependent region)
- XT62
- LU 6.2 and OTMA PST extension
- YQAB
- OTMA queue anchor block