Table A (File architecture)

Table A contains three structures:

A dictionary of the fieldgroup / field names and their attributes.

Some attributes (notably 'CODED') require lists of values to be maintained. These lists are stored either in the FEW-VALUED or MANY-VALUED structures.

Table A usually is small in relation to the rest of the file. The field name section in particular should be as small as possible to aid efficient access, especially if your site uses field name variables

Internal File Dictionary

FILEORG x'100' Files

With the introduction of X'100'files (in Model 204 V7R5) the maximum number of fields (ASTRPPG * ATRPG) in a file has been increased to 32000. In order to support this increase, as well as the additional attributes. the field code has been increased from 2 to three bytes.