In-place MERGE and logical end-of-file
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USupported on UNIX
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System option #18 controls how the in-place MERGE statement handles the logical end-of-file in the primary file. (An in-place MERGE merges two or more sorted files without creating a new output file; the secondary file is merged into the first input file.)
If you set option #18, the in-place MERGE extends the primary file by the number of records merged from the secondary file. All records past the logical end-of-file in the primary file are copied to the end of the primary file’s extension.
If you don’t set option #18, the in-place MERGE treats any logical end-of-file character or record as the end of usable data in the primary file. Any records that follow the logical end-of-file are overwritten.
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