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IGW8PNRU routine for batch override z/OS DFSMStvs Administration Guide GC52-1388-00 |
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To prevent damage to a data set, DFSMStvs defers the decision whether to back out a specific record to an installation exit, the batch override exit. This is an optional exit that Transaction VSAM calls when it backs out a unit of recovery (UR) that involves a data set that might have been impacted by the IDCAMS SHCDS PERMITNONRLSUPDATE command. The exit is called once for each affected undo log record for the data set. The purpose of this exit is to return to DFSMStvs with an indication
of whether or not the backout should be applied. The input is an undo
log record (mapped by IGWUNLR) and a data set name. The output is
a Boolean response of whether or not to do the backout, returned in
register 15:
The exit is given control in the following environment:
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