are stored in the same SAS library as the data set that they index,
but in a separate SAS file from the data set. Index files have a member
type of INDEX. There is only one index file per data set; all indexes
for a data set are stored together in a single file.
The following figure
shows the relationship of SAS data set files and SAS index files in
a Windows operating environment. Notice that the index files have
the same name as the data set with which they are associated, but
they have different file extensions. Also, notice that each index
file can contain one or more indexes, and that different index files
can contain indexes with identical names.
Note: Index files are stored in the ...