Compressing a PDS

IEBCOPY can be used to compress a PDS. A PDS may contain unused areas from a deleted member, or the old version of an updated member. Compressing a PDS involves removing unused or deleted members and reclaiming space within the dataset. This helps in optimizing storage usage.

Practical Example -

Scenario - Compress a PDS.

JCL -

----+----1----+----2----+----3----+----4----+----5----+
//MATEPKC  JOB (123),'MTH',CLASS=A,MSGCLASS=A,MSGLEVEL=(1,1),
//             NOTIFY=&SYSUID
//***********************************************
//* COMPRESS THE PDS
//***********************************************
//STEP10   EXEC PGM=IEBCOPY
//SYSPRINT DD SYSOUT=*
//SYSOUT   DD SYSOUT=*
//SYSDUMP  DD SYSOUT=*
//SYSUT1   DD DSN=MATEPK.IEBCOPY.INPPDS,DISP=SHR
//SYSIN    DD *
  COPY OUTDD=SYSUT1,INDD=SYSUT1
/* 

Job Status -

Explaining Example -

• SYSUT1 DD DSN=MATEPK.IEBCOPY.INPPDS - Specifies the PDS that needs to be compressed.
• SYSIN DD - Has the control statements for processing the input.
• COPY OUTDD=SYSUT2,INDD=SYSUT1 - INDD, OUTDD should be same to compress it.