Starting Your Product › Configuring Runtime: IMS and CICS › Define IMS Block Mode Applications › Define PSBs

Define PSBs

To define the IMS Program Specification Blocks (PSBs) for the IMS application you are deploying, use the following order for the Program Control Blocks (PCBs):

• CA Gen requires I-O PCB first. By default, the I-O PCB is generated automatically from the initial request.
• CA Gen requires the second PCB to be an alternate, modifiable I-O PCB with EXPRESS=NO. Do not code ALTRESP on the second PCB because CA Gen issues CHNG calls to other transactions, not terminals.
• All other PCBs must appear after the alternate, modifiable I-O PCB.

  PCB TYPE=TP,MODIFY=YES
  PCB TYPE=DB...
  PCB TYPE=DB...
  PSBGEN
  PSBNAME=progname,LANG=COBOL,
  CMPAT=YES
  END
  

Note: Failure to create the PSB according to this convention may result in loops or other unpredictable behavior in message switching.

DB2 assumes plan name and PSB name are the same. If your installation requirements are different, assemble a DSNMAPN macro and link it into the DB2 load library for each trancode.