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SAS/ACCESS Interface to IMS-DL/I Software |
An access descriptor contains information about the IMS-DL/I database you want to use. The information includes the IMS-DL/I database name, the IMS-DL/I field names and their default SAS formats, database formats, segment names and lengths, and key fields. An access descriptor also contains any special handling considerations for a field and indicates if an item occurs multiple times in a database segment. You use the access descriptor to create view descriptors. An access descriptor is like a master descriptor file for a single IMS-DL/I database because it contains a complete description of that database (if you choose to enter all the data). Because IMS-DL/I does not store descriptive information about a database, you must enter the database definition in the access descriptor.
A view descriptor is a SAS data set of member type VIEW. After you create your view descriptors, you can use them in a SAS program to read or write the data directly from and to an IMS-DL/I database, or you can extract IMS-DL/I data and place them in a SAS data file. Typically, you have several view descriptors (each selecting a different path of data in the database) for each access descriptor that you have defined.
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