Requests on IMS output messages

The response and sync-point requests for IMS output messages are summarized in the following table.

An X in the table indicates that the corresponding entry is supported by IMS.

Table 1. Response and sync-point requests for IMS output messages
Output message types VTAM indicators with message
RQE11 RQD1 RQE21 RQD2
CD ¬CD CD ¬CD CD ¬CD CD ¬CD

Update, recoverable

         X     X

Inquiry, recoverable

         X     X

Inquiry,
nonrecoverable

 X     X        

Fast Path
(recoverable)

               X

Nonlast MFS page
(autopaged)

  

See notes2

  

See notes2

        

First chain demand-
paged output

                

ATTACH
(no SCHEDULER)

 X              
ATTACH SCHEDULER               X
Nonlast MFS page (demand-page) X              
Last MFS page (autopaged or without OLP) recoverable, nonrecoverable         X     X
Last MFS page (with OLP)3 X              
IMS command reply: /DISPLAY, /RDISPLAY, /FORMAT         X     X
IMS command reply: /TEST X              
Other IMS command replies       X        
Test mode output4 X     X        
Broadcast output (ATTACH SYSMSG)         X     X
System error messages (ATTACH SYSMSG) X     X X     X
Message switch output         X     X
VTAM commands5 X     X        
FMH7 (ERP) messages X     See notes6        
QSTATUS (QMODEL)7 X       X     X
Notes:
  1. A response is implied by a reply to the change-direction indicator; therefore, IMS indicates RQE1 or RQE2 when sending the change-direction indicator. Either method of requesting a response is supported for the session BIND option DEFINITE RESPONSE CHAINS.
  2. RQD1 occurs on each chain rather than RQE1 when IMS is bound as RQD only, and on the first page of MFS autopaged output to prevent unnecessary ERP overhead if errors or contention is detected by the receiver.
  3. MFS operator logical paging is in effect if the MOD specifies PAGE=YES and autopaged output is not indicated in the MFS system control area.
  4. Applies to test echo mode only. Not applicable to /TEST MFS.
  5. CHASE is always sent RQE1/CD.
  6. Sent with EB.
  7. CD/RQE1 is sent on QSTATUS, which results from an invalid cursor in an MFS DPM demand-page request for output sent as ATTACH SCHEDULER. CD/RQE2 or EB/RQD2 is sent on QSTATUS, which results from the receipt of QPURGE during demand-paged output. CD/RQE2 is sent:
    • When operating in IMS conversation or in test mode
    • When the input is sent with ATTACH SCHEDULER and the associated output component is SINGLE2 or MULT2.
    All other cases result in EB/RQD2.