A key override changes the Platform’s choice of best key for matching connected datasets, while using multiple key overrides can improve the match rate.
For example, you might have a pair of datasets with two keys: one containing relatively out-of-date data, and one containing data that is known to be current. Normally, InfoSum Platform will select the key with the higher key fill rate. Using a key override, you can tell InfoSum Platform to use a different key even if its fill rate is lower.
Counting and matching prioritized keys in key overrides
Overriding the Platform's automatically selected key creates a lower match rate, but adding multiple common keys in the prioritized key field can improve the match rate. If you choose to match on multiple keys, a match on any key counts toward the audience total (with multiple matches for a record counted only once) because it uses the OR function. If the datasets contain duplicates, changing the order of the keys can change the count total.