|SAS/ACCESS Interface to ADABAS Software
Changes to an ADABAS file or NATURAL DDM
can affect associated SAS/ACCESS descriptor files. If changes to ADABAS
data invalidate your descriptor files, you must fix them manually by following these steps:
- When you change an
ADABAS file or NATURAL DDM, you must re-create the access descriptor(s) with the ACCESS procedure, using the same access descriptor
- Then you must update each view descriptor with PROC ACCESS. Change the view descriptor as
SAS/ACCESS interface view engine does a rudimentary validation of a view descriptor upon opening it. For example, the engine checks data type and data field
grouping information. If a problem is found, the engine writes a message to the log and stops.
ADABAS data, consider the guidelines listed below.
|Changes That Have No Effect on Existing View Descriptors|
The following changes to an ADABAS file
or NATURAL DDM have no effect on existing view descriptors:
- creating ADABAS
- inserting new data fields.
- deleting data fields not referenced in any view descriptor. (Note that if an
access descriptor includes the deleted data field, users could eventually create a view descriptor using that data field, which would be a problem.)
|Changes That Might Have an Effect on Existing View Descriptors|
The following changes to an ADABAS
file or NATURAL DDM might have an effect on existing view descriptors:
- changing a data field name. If the data field name was used in selection criteria
stored in the view descriptor, when you try to use the view descriptor, you will receive a syntax error message indicating an unrecognized data field
- deleting ADABAS descriptor data fields if the field is used in selection
|Changes That Cause Existing View Descriptors to Fail|
The following changes to an ADABAS file or
NATURAL DDM cause existing view descriptors to fail when they are used:
- changing a numeric type to a character
- changing a character type to a numeric type.
- deleting a data field that is referenced in a view
- modifying a periodic group field or a multiple-value field. A field defined as a periodic group, a field within a periodic group, or a
multiple-value field must retain its properties.
- changing lengths that affect a SAS format. Certain ADABAS numeric types
are changed to character hexadecimal when their lengths are too large for the SAS System to handle. You cannot change lengths that result in changing SAS formats from character to numeric or numeric
- changing superdescriptors, superfields, subdescriptors, and subfields. You cannot change the definition of these field types, such as adding or
subtracting parentage information, changing the order of parentage information, or changing the from-to specification.
Copyright 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.