# How Customer Profiles adds keys to the index for lookups
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The following diagram shows how Customer Profiles processes the standard identifiers to determine whether to persist the key. 

![A flowchart showing the decision process for persisting keys in Customer Profiles based on lookup and new object criteria.](http://docs.aws.amazon.com/connect/latest/adminguide/images/customer-profiles-template2.png)


The flowchart shows the following steps:

1. Does the key have `LOOKUP_ONLY` specified?
   + If Yes, don't persist the key.

1. If No, does the key have `NEW_ONLY` specified?
   + If No, save the key in the index to allow it to be used for lookups.

1. If Yes, has ingesting the object results in creating a new profile? 
   + If Yes, save the key in the index to allow it to be used for lookups.
   + If No, don't persist the key in the index for future lookups.