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Custom Index on Deterministic Formula Field

Since the Winter ’13 release, you have been able to contact salesforce.com Customer Support to create a custom index on a formula field, provided that the function that defines the formula field is deterministic.
Here are examples of common non-deterministic formulas. Force.com cannot index fields that:
  • Reference other entities (i.e., fields accessible through lookup fields)
  • Include other formula fields that span over other entities
  • Use dynamic date and time functions (e.g., TODAY, NOW)

A formula is also considered non-deterministic when it includes:
  • Owner, autonumber, divisions, or audit fields (except for CreatedDate and CreatedByID fields)
  • References to fields that Force.com cannot index
    • Multi-select picklists
    • Currency fields in a multicurrency organization
    • Long text area fields
    • Binary fields (blob, file, or encrypted text)
  • Standard fields with special functionalities
    • Opportunity: Amount, TotalOpportunityQuantity, ExpectedRevenue, IsClosed, IsWon
    • Case: ClosedDate, IsClosed
    • Product: Product Family, IsActive, IsArchived
    • Solution: Status
    • Lead: Status
    • Activity: Subject, TaskStatus, TaskPriority
Because values might vary over time or change when a transaction updates a related entity, Force.com cannot index non-deterministic formulas.

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