A keyed data page front loads the data from the data source and then uses one or multiple keys to locate and return matching instances. The keyed data page is the best implementation when there are frequent unique queries before the information becomes stale.
Keyed access is configured for data pages with a list structure only. The key, or combination of keys, identifies a single item in the list.
To use a single key to identify multiple items in the list, select the Allow multiple pages per key check box. If this option is not selected and there are multiple matches, the first matching instance is returned.

The keyed data page serves as an alternative to having two separate data pages, one page to return a list of items and a second page to return information about a single item in the list.
We need to reference the keyed data page in the page property using the selected keys.
Keyed data access is fast and more efficient compared to parameterized data pages.A data page that uses parameters makes a server trip for each unique request. This implementation is not ideal for frequent requests.

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