z/OS DFSMS Using Data Sets
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Modifying Sequential Data Sets

z/OS DFSMS Using Data Sets
SC23-6855-00

You can modify a sequential data set in three ways:
  • By changing the data in existing records (update-in-place).
  • By adding new records to the end of a data set (extends the data set).
  • Or, by opening for OUTPUT or OUTIN without DISP=MOD (replaces the data set's contents). The effect is the same as when creating the data set.

Related reading: See Creating a Sequential Data Set.

Parent topic: Processing Sequential Data Sets

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