Microsoft Exam AZ-204 Topic 8 Question 56 Discussion

Actual exam question for Microsoft's AZ-204 exam

Question #: 56
Topic #: 8

[All AZ-204 Questions]

You are developing a mobile instant messaging app for a company.

The mobile app must meet the following requirements:

* Support offline data sync.

* Update the latest messages during normal sync cycles.

You need to implement Offline Data Sync.

Which two actions should you perform? Each conn I answer presents part of the solution.

NOTE: Each correct selection is worth one point.

ARetrieve records from Offline Data Sync on every call to the PullAsync method.

BRetrieve records from Offline Data Sync using an Incremental Sync.

CPush records to Offline Data Sync using an Incremental Sync.

DReturn the updatedAt column from the Mobile Service Backend and implement sorting by using the column.

EReturn the updatedAt column from the Mobile Service Backend and implement sorting by the message id.

Show Suggested Answer

Suggested Answer: B, E

B: Incremental Sync: the first parameter to the pull operation is a query name that is used only on the client. If you use a non-null query name, the Azure Mobile SDK performs an incremental sync. Each time a pull operation returns a set of results, the latest updatedAt timestamp from that result set is stored in the SDK local system tables. Subsequent pull operations retrieve only records after that timestamp.

E (not D): To use incremental sync, your server must return meaningful updatedAt values and must also support sorting by this field. However, since the SDK adds its own sort on the updatedAt field, you cannot use a pull query that has its own orderBy clause.

https://docs.microsoft.com/en-us/azure/app-service-mobile/app-service-mobile-offline-data-sync

by Sage at May 07, 2022, 07:38 AM

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