The alternate key definitions, if any. A legacy dataset might not have any alternate key defined, but if those alternate keys definitions exist, provide them as some applications will make use of them.
Indicates whether indexes for this dataset are stored as compressed values. If you have a large data set (typically > 100 Mb), consider setting this flag to True.
The character set used by the data set. Can be ASCII, EBCDIC, or unknown.
The record format of the data set.
The primary key of the data set.
The attributes of a VSAM type data set.