z/OS MVS JCL Reference
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Record length requirements

z/OS MVS JCL Reference

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The maximum supported record length (LRECL) is 32760 bytes. Fixed record length data sets and in-stream data sets are examined to determine if their records contain sequence numbers. If sequence numbers exist, they are assumed to consist of 8 contiguous numeric characters occupying the last 8 bytes of the input record. If a record is found to contain a sequence number, the length of the input record is adjusted to remove the sequence number.

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