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•
MSGLEN=length - The length of the MSGAREA specified above. The size of
a message is 128 bytes.
•
OPTCD=(
ASY
- Asynchronous access; VSAM returns control to the program after
scheduling the request so the program can do other processing while the
request is earned out. SYN is the default and specifies that VSAM will
return to the processing program when the request is complete.
WAITX
- If ″OPTCD=(..,SYN..)″ and the specifics ″MACRF=(..,LSR or
GSR..)″,
and
″EXLST ...,UPAD=″, then VSAM branches to the UPAD
routine address when VSAM would otherwise have issued a WAIT. The
most common use of UPAD routines is by IMS/VS or it may be used as a
replacement for the VSE VSAM EXCPAD routines.
13.2.5.4 SHOWCB Macro
The VSE VSAM SHOWCB macro may not be source compatible depending on the
fields requested. The use of the macro and the results should be carefully
examined.
MVS VSAM Additional SHOWCB Fields
•
BFRFND - Number of successful GETs without physical reads required. (LSR
or GSR only)
•
BUFRDS - Number of GETs requiring physical reads. (LSR or GSR only)
•
ENDRBA - Ending RBA of the space used by the data or index components
(that is, the last byte used in the component).
•
HALCRBA - The High-Allocated-RBA of the specified component.
•
NUIV - Number of physical WRITEs not issued by the user. (LSR or GSR
only)
•
UIW - Number of WRITEs issued by the user. (LSR or GSR only)
13.2.5.5 MVS VSAM CHECK Macro
The MVS VSAM CHECK macro is used to suspend processing until VSAM has
completed the request associated with the RPL. This macro is used for
asynchronous processing (that is, OPTCD=(ASY..).
13.2.5.6 VSE VSAM TCLOSE Macro
The TCLOSE macro of VSE is coded in MVS: ″CLOSE ...,TYPE=T″
13.2.5.7 VSAM Error and Reason Code Compatibility
MVS VSAM error codes and reason codes may have a slightly different meaning
than VSE VSAM. In all cases, MVS documentation should be consulted.
Especially in Assembler, the logic for specific error codes should be verified. In
some cases, MVS VSAM provides additional information.
13.2.6 Data Management Macros
This section compares the VSE and MVS data management macro instructions.
Detailed information on the coding of MVS data management macro operands
can be found in the publication
DFSMS/MVS Macro Instructions For Data Sets
,
SC26-4913.
Note: As a VSE user, you are familiar with the term filename. In MVS, filename
is referred to as dcbaddress.
292 VSE to OS/390 Migration Workbook