Vendor: Microsoft
Certifications: Microsoft Certifications
Exam Code: DP-420
Exam Name: Designing and Implementing Cloud-Native Applications Using Microsoft Azure Cosmos DB
Updated: Jun 14, 2026
Q&As: 176 ( View Details)
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HOTSPOT
You have an Azure Cosmos DB Core (SQL) API account named storage1 that uses provisioned throughput capacity mode.
The storage1 account contains the databases shown in the following table.

The databases contain the containers shown in the following table.

For each of the following statements, select Yes if the statement is true. Otherwise, select No.
NOTE: Each correct selection is worth one point.
Hot Area:

Correct Answer:

Box 1: No
Four containers with 1000 RU/s each.
Box 2: No
Max 8000 RU/s for db2. 8 containers, so 1000 RU/s for each container.
Box 3: Yes
Max 8000 RU/s for db2. 8 containers, so 1000 RU/s for each container. Can very well add an additional container.
Reference:
https://docs.microsoft.com/en-us/azure/cosmos-db/plan-manage-costs
https://azure.microsoft.com/en-us/pricing/details/cosmos-db/
You have a container named container1 in an Azure Cosmos DB Core (SQL) API account. Upserts of items in container1 occur every three seconds.
You have an Azure Functions app named function1 that is supposed to run whenever items are inserted or replaced in container1.
You discover that function1 runs, but not on every upsert.
You need to ensure that function1 processes each upsert within one second of the upsert.
Which property should you change in the Function.json file of function1?
A. checkpointInterval
B. leaseCollectionsThroughput
C. maxItemsPerInvocation
D. feedPollDelay
Correct Answer: D
With an upsert operation we can either insert or update an existing record at the same time.
FeedPollDelay: The time (in milliseconds) for the delay between polling a partition for new changes on the feed, after all current changes are drained. Default is 5,000 milliseconds, or 5 seconds.
Incorrect Answers:
A: checkpointInterval: When set, it defines, in milliseconds, the interval between lease checkpoints. Default is always after each Function call.
C: maxItemsPerInvocation: When set, this property sets the maximum number of items received per Function call. If operations in the monitored collection are performed through stored procedures, transaction scope is preserved when reading items from the change feed. As a result, the number of items received could be higher than the specified value so that the items changed by the same transaction are returned as part of one atomic batch.
Reference: https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-cosmosdb-v2-trigger
You have an Azure Cosmos DB database that contains a container named container1. The container1 container is configured with a maximum of 20,000 RU/s and currently contains 240 GB of data.
You need to estimate the costs of container1 based on the current usage.
How many RU/s will be charged?
A. 240
B. 4,000
C. 20,000
D. 24,000
Correct Answer: B
Incorrect:
Not A: Request Units in Azure Cosmos DB
The minimum RU/s is here MAX(400, 240 * 1 RU/s per GB, 20,000 RU/s / 100) = MAX(400, 240, 200)=400 RU/s.
Note: Minimum throughput on container
To estimate the minimum throughput required of a container with manual throughput, find the maximum of:
400 RU/s
Current storage in GB * 1 RU/s
Highest RU/s ever provisioned on the container / 100
For example, you have a container provisioned with 400 RU/s and 0-GB storage. You increase the throughput to 50,000 RU/s and import 20 GB of data. The minimum RU/s is now MAX(400, 20 * 1 RU/s per GB, 50,000 RU/s / 100) = 500 RU/
s. Over time, the storage grows to 2000 GB. The minimum RU/s is now MAX(400, 2000 * 1 RU/s per GB, 50,000 / 100) = 2000 RU/s.
Reference: https://learn.microsoft.com/en-us/azure/cosmos-db/concepts-limits
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