//JOBCARD...          
//*-------------------------------------------------------------------*
//*     Alter GDG limit
//*     Sample JCL only - Changes are required to run in your data center
//*     Verify all parameters with the appropriate vendor manual
//*-------------------------------------------------------------------*                   
//STEP1    EXEC  PGM=IDCAMS                                   
//SYSPRINT DD    SYSOUT=A                                     
//SYSIN    DD    *                                            
     ALTER -                                                  
           MIKE.GDG -                                  
           LIMIT(20)                                          
 /*