6.2.40.7 WRITE for Indexed Files
Before the WRITE statement is executed, you must set the prime record key (the RECORD KEY data item, as defined in the File-Control entry) to the desired value. (Note that RECORD KEY values must be unique within a file.)
If the ALTERNATE RECORD KEY clause is also specified in the File-Control entry, each alternate record key must be unique, unless the DUPLICATES phrase is specified. If the DUPLICATES phrase is specified, alternate record key values might not be unique. In this case, the system stores the records so that later sequential access to the records allows retrieval in the same order in which they were stored.
When ACCESS IS SEQUENTIAL is specified in the File-Control entry, records must be released in ascending order of RECORD KEY values.
When ACCESS is RANDOM or ACCESS IS DYNAMIC is specified in the File-Control entry, records may be released in any programmer-specified order.
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