If the comparison is not satisfied by any record in the file, an invalid key condition exists; the position of the file position indicator is undefined, and (if specified) the INVALID KEY imperative-statement is executed. (See "Invalid Key Condition" under "Common Processing Facilities" in topic 6.1.8.9.)
The INVALID KEY phrase must be specified if no EXCEPTION/ERROR procedure is explicitly or implicitly specified for this file.
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