Choosing a logical record length for HD databases

In HD databases, the important choice is not logical record length but CI or block size.

Logical record length is the same as block size when VSAM is used. Logical record size is equal to CI size, minus 7 bytes of overhead (4 bytes for a CIDF, 3 bytes for an RDF).

As with HISAM databases, specify the length of the logical records in the RECORD= operand of the DATASET statement in the DBD.