FABHBSIM JCL example

Use the following JCL examples to prepare your FABHBSIM JCL.

To use FABHBSIM in simulating buffer handlers and tuning buffers, use the JCL shown in the following figure.

Figure 1. FABHBSIM JCL for simulating a buffer handler

//BSIM   EXEC FABHULU,MBR=FABHBSIM,DBD=USERDBD
//HSSROPT  DD *
CABSTAT YES
/*
//HSSRCABP DD *
CABDD *HD
NBRSRAN 30
/*
//SYSUT1   DD DSN=TESTDS.HSSRBUTR.DATASET,DISP=OLD,UNIT=tape,VOL=SER=yyyyyy
//HDAM     DD DSN=TESTDS.HDAM,DISP=SHR

The CABDD control statement specifies that the succeeding CAB control statements apply to all HD databases. The NBRSRAN control statement specifies that 30 ranges should reside in the buffer for look-aside buffering purposes. (Other HSSRCABP control statements can be inserted as appropriate.) 'CABSTAT YES' in HSSROPT DD requests that HSSR Engine produce detailed CAB Statistics report.

The SYSUT1 DD statement defines an input data set, which is the HSSRBUTR data set produced by an earlier run of an IMS High Performance Unload job.

The HDAM DD statement defines an IMS database.

Statistical reports can be analyzed to tune the CAB buffering parameters.