In situations where there is more than one load process configured for a VDPCache job, I would provide the Concurrency Level equal to how many load processes are configured. Generally, the "Concurrency Level" parameter in the CacheJob's Extraction section defines the load processes concurrency, meaning how many cache processes will be executed in parallel. The optimal number for this Concurrency level would depend on the use case. For instance, if there are 6 load processes I would specify the Concurrency Level as 6. The default value for the Concurrency Level would be 1.
You can take a look at the [VDPCache Extraction Section](https://community.denodo.com/docs/html/browse/8.0/en/scheduler/administration/creating_and_scheduling_jobs/configuring_new_jobs/vdpcache_extraction_section#:~:text=the%20job%20execution%20(-,Concurrency,-Level) of the Scheduler Administration Guide for more information.
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Hope this helps!