When you obtain a description of the data file you are going to use for your report, you will notice that the file is described in these terms:
Indicates the length of a single record measured in characters or bytes.
Indicates the number of records stored next to each other before there is a spacing interval. The block size is also measured in bytes.
Indicates whether the records in the file equal (fixed) in length, vary in length, or have an undefined length.
Indicates how the records are organized in the file. The possibilities are a sequential file, an ISAM file, a card file, a VSAM file, or a database.
The file description also gives size and location of each data field:
Indicates the beginning location of the field.
Indicates is the amount of space allocated for the particular field. The field length is expressed in bytes.
Identifies the data as: alphanumeric (a combination of alphabetic characters and numbers) or numeric (zoned decimal, packed decimal, unsigned packed decimal, binary, or bit).
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