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What's the difference between Field History Tracking, which needs to be activated and works only for 20 fields per object and History tables like AccountHistory, CustomObject__History ? Why would I enable Field History Tracking, if I can easily use those tables?

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    CustomObject__History table starts tracking the history of a field customField__c only if you enable field history tracking for that field otherwise it won't.
    – javanoob
    Commented Feb 21, 2017 at 14:33
  • ah, i see...so the table would be empty, if i don't specify any tracking for field?
    – Martin.Kona
    Commented Feb 21, 2017 at 14:35
  • CustomObject__History table is created only if we enable field history tracking for at least one field of that object otherwise the table won't exist.
    – javanoob
    Commented Feb 21, 2017 at 14:39
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    @javanoob Why don't you migrate your comments into an answer? I thought it was a pretty good question, and worthy of the good answer you provided in the comments.
    – John Thompson
    Commented Feb 21, 2017 at 15:55

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Converting comments into answer:

  1. CustomObject__History table starts tracking the history of a field customField__c only if you enable field history tracking for that field otherwise it won't.
  2. CustomObject__History table is created only if we enable field history tracking for at least one field of that object otherwise the table won't exist.
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