Define Cluster

IDCAMS Define Cluster Example

Define Cluster Tutorial   

Scenario - Create ESDS with fixed-length records of size 47 bytes.

JCL -

----+----1----+----2----+----3----+----4----+----5
//MATEPKE JOB (123),'MTH',CLASS=A,
//             MSGCLASS=A,
//             MSGLEVEL=(1,1),
//             NOTIFY=&SYSUID
//*********************************************
//* Creating fixed-length ESDS
//*********************************************
//STEP01   EXEC PGM=IDCAMS
//SYSPRINT DD SYSOUT=*
//SYSIN    DD  *
  DEFINE CLUSTER -
    (NAME(MATEPK.TEST.ESDS)  -
     RECORDSIZE(47,47)    -
     CYLINDERS(2,1)       -
     CISZ(4096)           -
     VOLUMES(DEVHD4)      -
     NONINDEXED           -
     REUSE     )          -
  DATA(NAME(MATEPK.TEST.ESDS.DATA))
/*

Output -

Once the above JCL is submitted, check the MAXCC of the job for any errors. If the MAXCC is 00 or 04, ESDS successfully created.

ESDS SYSPRINT

Verify the ESDS in 3.4 (Dataset List utility) or any File management tools.

ESDS OUTPUT

Explaining Example -

In the above example,

  • RECORDSIZE(47,47) specifies the record average length is 47, and the maximum size is 47. So the ESDS file we are creating is fixed-length.
  • CYLINDERS(2,1) specifies the primary memory allocation is 2 CYLINDERS, and secondary memory allocation is 1 CYLINDER.
  • CISZ(4096) specifies the control interval size is 4096.
  • VOLUMES(DEVHD4) specifies that allocate the ESDS on volume DEVHD4.
  • NONINDEXED parameter specifies the file is to create ESDS.
  • REUSE specifies the memory can reuse immediately once the file gets deleted.