Identifying Unique Visitors
The method for identifying unique visitors among multiple contexts includes a prioritized sequence to ensure accuracy in this determination. The following table shows this prioritized sequence:
Order used
Query parameter (collection method)
post_visid_type column value
Present when
2
aid s_vi cookie
3
Visitor had an existing s_vi cookie before you deployed the Visitor ID service, or you have a Visitor ID grace period configured.
3
5
Visitor’s browser accepts cookies (first-party), and the Identity Service is deployed.
4
4
Visitor’s browser accepts cookies (first-party).
For information on how unique visitors are reported, see Unique Visitors in Analytics.
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