Parallel apply

Parallel apply processing improves the performance of your replication environment by applying units of recovery (UORs) concurrently to target data sets.

Minimize latency

Parallel apply enables you to minimize latency by writing all available work across your subscriptions in near-real time. Within a single subscription, dependencies on UORs that update the same data set record are a limiting factor. In this case, Data Replication for VSAM places a higher priority on maintaining the precise order of changes as they occurred at the source data set.

For UORs that change separate data sets, delays or outages can prevent Data Replication for VSAM from applying changes in strict order.

An administrator can disable parallel apply manually by modifying the subscription to perform serial processing.

Restrictions

UORs with ESDS inserts: You might not get the full performance benefits of parallel apply if UORs insert ESDS records into the same data set. The system performs dependency analysis that causes these UORs to be applied serially.