An example method includes accessing a network communication at a database proprietor server, the network communication including one or more audience measurement entity cookie identifiers associated with one or more audience measurement entity cookies, the one or more audience measurement entity cookies from an audience measurement entity server and stored in a client device; generating one or more cookie mappings of the audience measurement entity cookies to respective one or more database proprietor cookies, the one or more database proprietor cookies from the database proprietor server and stored in the client device; and causing transmission of one or more re-direct messages to cause the client device to send the one or more cookie mappings in a batch to the audience measurement entity server, a re-direct message of the one or more re-direct messages including a first database proprietor cookie identifier and a first audience measurement entity cookie identifier.