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Mass Update (How to)

Greetings Everyone,

I require the need to update a UDF alphanumeric value for about 2000 Individuals. The update for this UDF is the first 6 characters of another alphanumeric UDF for the same Individual; therefore, a simple mass update via the GUI will not work in this case. Thinking I have two options.

  1. Query for the 2000 via search criteria. Once received, enumerate through the 2000 applying the update via a single API call for each (i.e., 2000 calls to the API, which may be throttled?).
  2. Or, query for the 2000 via search criteria. Once received, enumerate through the 2000 building a batch update request for each, then making one (1) call to the API (assume there is a limit to the number of updates in a batch update via the API?).

Please advise on the best approach, thanks,

Joe