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smitrasmitra 

When huge number of data is synced from offline to online does it synced one by one/several data at a time?

When huge number of data is synced from offline to online does it synced one by one/several  data at a time?
john yungkjohn yungk
If you're using Bulk API, then the default concurrency processing mode is Parallel, which provides one of the significant performance advantages with Bulk. This can be overridden in the JobInfo by setting concurrencyMode to Serial and can be used if Parallel is causing lock record errors, but loads will run slower.