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The PSO interface uses catalogued data sets as a staging area. This provides a more reliable means of transferring data than temporary data sets, and also permits PSO transfers to be checkpointed (and restarted) if necessary. The checkpoint count for PSO transfers, PSOCKPT, is set to 1000 by default. This value can be defined in the CA XCOM Data Transport default options table or in the destination members. For PDSE program library transfers, CKPT parameter is used to indicate the checkpoint value.
PSO data set names and temporary data sets created for PDSE program library transfers are controlled by the PSOPREF parameter. This parameter specifies the high-level qualifier used by CA XCOM Data Transport when creating data sets. CA XCOM Data Transport then deletes these data sets after a file has been successfully transferred.
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