Exam PEGAPCSSA87V1 topic 1 question 53 discussion

Since the MSDS rarely changes, it is unnecessary and not recommended to make repeated trips to an external System of Record, we would only make frequent trips to the SOR if the data frequently changes, in this example we can fetch the data once per day or once per week and it will be up to date

Keyed data pages can have multiple keys and embbeded pages. Data pages provide a performance improvement for Pega Platform™ applications by caching information in memory, rather than querying a data store, such as a database or web service. Data pages typically return either a list of items or information about a single item. To provide instant access to a particular item in a list-structure data page, you can enable keyed access. By using keyed access, you avoid maintaining two separate data pages: one page to return a list of items and a second page to return information about a single item. Using a keyed data page when retrieving data for application use can make processing more efficient by reducing the number of exchanges with a system of record.

yes A is correct answer. Allowing multiple pages for each key is an checkbox present in Data page, if it is checked, when multiple records are feteched for a key all records will be returned, if not checked only the first hit record will be returned. which is all unnecessary here because the it is clearly mentioned there is one MSDS for one product, we will use keyed data page that will fetch one record after the data page is loaded

A is the correct answer. When processing thousands of online orders a day and the MSDS rarely changing and “ When buyers select an item to order, the application displays the MSDS”, there is only one item extracted from the data page list each time.