Salesforce External ID

 An External Id is a custom field that has "External Id" attribute checked. Its used to contain unique record identifiers from a system outside of Salesforce.

Salesforce allows us to mark only custom field with data type Text, Number or Email as External Id.

Note: External Id is not case-sensitive. 

Considerations:

  • External Id is an attribute that can be added to a custom field to indicate that it should be indexed and treated as an Id.
  • Its a user-defined cross-referenced field.
  • It can be created for custom field type(Text, Number and Email only).
  • Each object can have up to 25 External Ids.
Benefits: 
  • It helps improve report and API SOQL performance. 
  • It can be used with UPSERT DML operation to seamlessly integrate apps with other system.
  • No need to know Salesforce Record Id to load data.
  • Very convenient for data integrations and migrations.
  • The import wizard will detect existing records in Salesforce that have the same External Id.
  • It becomes searchable in the sidebar search.


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