Here's a scrubbed-up version of the last MERGECAT I ran. DD CATVOL is in the 
JCL but not referenced in IDCAMS control statements. As for the order of 
MERGECAT and DEF ALIAS, I put them in that order. Can't say if that's required. 

Note: in the original incarnation of MERGECAT, you were not allowed to REPRO 
out of a master catalog for safety reasons. That restriction was relaxed eons 
ago. In any case desk-check this very well to avoid utter catastrophe. ;-(

//STEP1    EXEC PGM=IDCAMS,REGION=32M                    
//CATVOL   DD  DISP=OLD,DSN=source-catalog              
//SYSPRINT DD  SYSOUT=*                                  
//SYSIN    DD  *                                         
   REPRO IDS(source-catalog) MERGECAT -                  
         LVL(hlq-to-move)       -                        
         ODS(target-catalog)                             
    IF LASTCC = 0 THEN DO                                  
       DEL hlq-to-move ALIAS   /* cleanup just in case */                       
         
       DEF ALIAS (NAME(hlq-to-move) REL(target-catalog) )       
   END                                                    

.
.
J.O.Skip Robinson
Southern California Edison Company
Electric Dragon Team Paddler 
SHARE MVS Program Co-Manager
323-715-0595 Mobile
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robin...@sce.com


-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf 
Of esmie moo
Sent: Friday, September 22, 2017 10:32 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: (External):Re: MERGECAT QUESTION

 Thanks Todd,
I looked at a few examples (IBM REDBOOK) and they have DD1 statements.  Do I 
need to use them as well?

    On ‎Friday‎, ‎September‎ ‎22‎, ‎2017‎ ‎11‎:‎27‎:‎09‎ ‎AM, Burrell, Todd 
<todd_burr...@csx.com> wrote:  
 
 I usually do the MERGECAT first and then define the alias.  I believe the 
ALIAS DEFINE will fail if there are entries in the MCAT that match it...  


-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf 
Of esmie moo
Sent: Friday, September 22, 2017 11:16 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: MERGECAT QUESTION

Gentle Readers,
We have about hundreds of user dsns which are cataloged in the MCAT because the 
alias for the users were not defined.My question is the sequence I should 
follow. For example do I define the ALIAS and then perform the MERGECAT? or I 
perform the MERGECAT and then define the ALIAS?I don't have a test system in 
which I can try it out.
Below is my jcl to run the MERGECAT:/*                                          
         //STEP1    EXEC PGM=IDCAMS,REGION=2048K,TIME=1440    //DD1      DD   
VOL=SER=MCAT03,UNIT=SYSALLDA,DISP=OLD//         DD   
VOL=SER=TST001,UNIT=SYSALLDA,DISP=OLD//SYSPRINT DD   SYSOUT=*                   
          //SYSIN    DD   *                                          REPRO -    
                                               INDATASET(TSUT3.MCAT)   -        
                    OUTDATASET(USERCAT.APPLIC) -                         
LEVEL(CTPRT17) -                                     MERGECAT -                 
                          FILE(DD1)                                 /*          
                                         //                                     
              Thanks.

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