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Classic CDC/ IIDR for VSAM needs to send only needed data for Replication
Classic CDC/IIDR for Vsam capture is sending the before values for all fields in source VSAM datasets. This adds significant overhead. The capture needs to send the before and after values of the key column and before and after image of the changed columns only (+ if any additional columns are enabled for conflict detection). This will provide significant performance benefits especially when replication is setup across long distance. Only needed data will be sent across the sites. This feature I believe is include in the IBM DB2 for Zos CDC capture with "minimize network load" option and even in QREP product with the "Changed_cols_only" option.
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