Tailoring execution JCL

The system log is required for any batch IMS that has update intent against any database and operates with active DBRC. The system log is not required if the batch system only uses read or read-only access intent.

When you are preparing a configuration that includes data sharing, you must:

• Specify system data sets.
• Specify the databases with DISP=SHR.
• Specify the placement of database data sets and device choices to suit the physical paths to the data.
• Prepare IRLM procedures.

The ACBLIB member online change process is coordinated among all IMS systems sharing the OLCSTAT data set. The system data sets that must be coordinated so that their status is common to all systems participating in data sharing are:

• RECON data sets
• Database data sets, with DISP=SHR specified
• IMS.ACBLIB, PSBLIB, and DBDLIB
• Libraries holding randomizing routines and DL/I exit routines

You also must set up IRLM procedures for your data-sharing configuration. For information on preparing the IRLM procedures for a data-sharing environment, see Setting up IRLM procedures.