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Retention is always set or updated when the data set is first introduced to the Media Database by Create, Recreate, or Dynamic Definition.
The RTNUPD parameter in the CTTPARM member can be used to update the retention in other situations, depending on the type of access to the data set (for example, DISP=MOD access). For more information, see the description of parameter RTNUPD in the INCONTROL for z/OS Installation Guide: Installing.
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