Key offset specification - Key = '800C'

DALKEYO specifies the key offset. The key offset is the position of the first byte of the key in each logical record of a the specified VSAM data set. If the key is at the beginning of the logical record, the offset is zero. When you code DALKEYO, # must be 1 and LEN must be 4, and PARM contains the key offset.

Example: To specify a key offset of 18 decimal (12: hexadecimal) bytes, code

KEY    #      LEN    PARM
800C   0001   0004   12