Your IDCAMs statements should be pretty much the same but the JCL is completely different.
* $$ JOB JNM=OGDEN12,CLASS=0,DISP=D
// JOB OGDEN12
// DLBL OGDEN,'OGDEN.DATA.VSAM',,VSAM,CAT=VSESPUC
// EXEC IDCAMS,SIZE=AUTO
DELETE (OGDEN.DATA.VSAM) CLUSTER PURGE -
CATALOG(VSESP.USER.CATALOG)
/*
// EXEC IDCAMS,SIZE=AUTO
DEFINE CLUSTER(NAME(OGDEN.DATA.VSAM) -
FILE(OGDEN) -
RECORDS (2000 1000) -
TO (99366) -
INDEXED -
KEYS(9 8) -
RECORDSIZE(72 100) -
CONTROLINTERVALSIZE(4096) -
SPANNED -
SHR(4) -
VOLUMES (DOSRES,SYSWK1)) -
DATA (NAME (OGDEN.DATA.VSAM.@D@)) -
INDEX (NAME (OGDEN.DATA.VSAM.@I@)) -
CATALOG(VSESP.USER.CATALOG)
/
Example taken from the extremely useful redbook