In orgs with large data volumes, it sometimes becomes necessary to ask Salesforce to create a custom index on a particular field, or combination of fields.
Once Salesforce creates a custom index, is there any way for a System Administrator to see that it, or any other custom index actually exists? It seems like the only way to do this right now is to contact Salesforce Support and ask them.
Please Note: I'm wondering specifically about custom indexes, which are only created by opening a case with Salesforce, and not default indexes. This question, "What standard and custom fields are indexed?" does a great job listing fields that get indexed by default.