describeSObjects(), getDeleted(), getUpdated(), query(), retrieve()
This object represents the history of a change to the Amount, Probability, Stage, or Close Date fields of an Opportunity. The OpportunityFieldHistory object represents the history of a change to any of the fields of an Opportunity. To obtain information about how a particular opportunity is progressing, query the OpportunityHistory records associated with a given Opportunity. Please note that if an opportunity's Amount, Probability, Stage, or Close Date fields have not changed, nothing will be returned in the OpportunityHistory objects. In this case, query the OpportunityFieldHistory records associated with a given Opportunity to get more information about changes to the opportunity.
This object is read-only. The system generates a new record whenever a user or client application changes the value of any of the above fields; the then-current values of all of these major fields are saved in the newly-generated object.
This object respects field-level security on the parent object.
The record is automatically deleted if its parent Opportunity is deleted.