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| Advanced User Topics for the SAS/ACCESS Interface View Engine for IMS |
Changing an IMS Database and the Effects on Descriptors
Changes to an IMS database can affect descriptor files. You must modify or re-create the descriptors if changes to the IMS database invalidate them. You use the ACCESS procedure to edit the affected access descriptors and view descriptors, or to create new descriptors.
If a view descriptor differs from the access descriptor, you receive a message. Re-create or edit the view descriptor as required. If you do not change your descriptor files, IMS might return incorrect data to you. If the changes to the database involve numeric data, the procedure that uses the view descriptor could terminate abnormally. See UPDATE Statement for information about editing descriptors.
Changing an item name has no effect on existing view descriptors. However, before you make other changes to IMS databases, consider the guidelines described in the next section.
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Copyright © 2007 by SAS Institute Inc., Cary, NC, USA. All rights reserved.