CDC Guide for z/OS

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Creating the Post-Log Merge Job

Each Post-Log Merge group requires a single Post-Log Merge job. This is a long-running job (just like the Logger) and is generally best setup as a Started Task. This job (or started task) can run on any MVS system within the sysplex.

All log readers (PowerExchange Listener, netport, and Condense jobs) connect to the Post-Log Merge job, which means that they must run on the same MVS system as the Post-Log Merge job. Log writers like ECCRs connect to member Loggers rather than the Post-Log Merge job.

Sample JCL for the Post-Log Merge job can be found in the PowerExchange SAMPLIB data set in member #POSTLOG. This JCL needs to be customized for your environment. The following example shows sample JCL for this job where the Post-Log Merge group is comprised of three member Loggers.

Sample JCL Statements for a Post-Log Merge Job:

//         JOB                                                          
//*-------------------------------------------------------------------* 
//* POST LOG MERGE 
//*-------------------------------------------------------------------* 
//* WARNING: DO NOT PLACE THE SECONDARY ERDS IN THE JOB OR INCORRECT
//*          RESULTS WILL OCCUR. 
//*-------------------------------------------------------------------* 
//* REPLACE THE FOLLOWING ITEMS WITH PROPER INSTALLATION VALUES
//* 1. JCL DATA SET NAMES 
//* 2. PRIMARY ERDS FROM EACH LOGGER 
//*-------------------------------------------------------------------* 
//READER   EXEC PGM=EDMLCTRD,PARM='TRACEE' 
//STEPLIB  DD DISP=SHR,DSN=<HLQ>.LOAD            <=== LOAD modules
//EDMPARMS DD DISP=SHR,DSN=<HLQ>.USERLIB         <=== EDMSDIR,EDMUPARM
//ERDS01   DD DISP=SHR,DSN=YOUR.SYSTEM1.ERDS     <=== ERDS OF SYSTEM 1
//ERDS02   DD DISP=SHR,DSN=YOUR.SYSTEM2.ERDS     <=== ERDS OF SYSTEM 2
//ERDS03   DD DISP=SHR,DSN=YOUR.SYSTEM3.ERDS     <=== ERDS OF SYSTEM 3
//SYSPRINT DD SYSOUT=* 
//SYSUDUMP DD SYSOUT=* 
//*-------------------------------------------------------------------*

Use the USERLIB that has been created for the MVS system on which the Post-Log Merge job runs.

For the DDNAME of the ERDS, you must use the following format:

//ERDSnn

The variable nn
represents a two-digit value from 01 to 99. When you set up the Post-Log Merge job, specify only one ERDS
nn
DD statement, usually the primary one, for each PowerExchange Logger.

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CDC Guide for z/OS

CDC Guide for z/OS

Creating the Post-Log Merge Job

Creating the Post-Log Merge Job