Editing VSAM RRDS and BDAM data sets
File-AID uses the sequence (or line) number area to indicate the RRN (Relative Record Number) for VSAM RRDS data sets and the RBN (Relative Block Number) for BDAM data sets. File-AID allows record insert and delete for VSAM RRDS, but the RRNs must be unique and in ascending sequence. BDAM records can only be updated, no record insert or delete is allowed.
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