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DB2

Tables,TableSpace,DataBase,Index,IndexSpace,BufferPool
DML -- Queries,SubQueries,Joins,Corr.SubQuery
DCL - Grant, Revoke
Cursors - Fetch, Open, Close
Bind , Rebind.
DCLGEN, SPUFI, QMF
Locks, Isolation Level, Cursor Stability, Repetable Read.
Coming, Rollback, Database Recovery.
Error Codes.

MVS

JES2, JES3
O/S - MVS, DOS, VSAM
Paging, Swapping.
Frames, Slots
Communication Devices, Control Units.
Processors
System Initialisation.
System DataSet.

JCL

Job Card
Exec, Prgm/ Proc, Restart, Cond, Param
DD ------ Disp, Space, DCB
Sysin,Sysout, Sysprint, Sysdumb,Sysabend
Instream & Catalog Procedure
Utilities - IEBGEN, SORT
GDG -- Limit, Scratch

VSAM

CI, CA, Splits
Freespaces.
Organisation of VSAM
ESDS, KSDS, RRDS, LDS
Define Cluster , AIX, BuildAoix, Verify, REPRO
IDCAMS