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| Section | Objectives |
|---|---|
| Topic 1: Design and implement data models for Azure Cosmos DB | - Design indexing strategies
|
| Topic 2: Optimize and maintain Cosmos DB solutions | - Performance optimization
|
| Topic 3: Integrate Azure Cosmos DB with Azure services | - Data pipelines and analytics
|
| Topic 4: Design and implement data distribution | - Partitioning and scaling
|
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質問 # 136
You have a container that stores data about families. The following is a sample document.
For each of the following statements, select Yes if the statement is true. otherwise, select No.
NOTE: Each correct selection is worth one point.
正解：
解説：
質問 # 137
You plan to create an Azure Cosmos DB database named db1 that will contain two containers.
One of the containers will contain blog posts, and the other will contain users. Each item in the blog post container will include:
- A single blog post
- All the comments associated to the blog post
- The names of the users who created the blog post and added the
comments to the blog post
Items in the blog post container will be partitioned based on the post ID. Items in the user container will be partitioned based on the user ID.
You need to minimize the number of request units allocated to queries that list all the posts of a given user. The solution must minimize administrative and development effort.
What should you include in the solution?
正解：D
解説：
To achieve the lowest possible Request Units (RU) for querying posts by a specific user while maintaining your current architecture, you should implement Asynchronous Data Denormalization.
Because your Blog Post container is partitioned by postID, a query for "all posts by a specific user" becomes a cross-partition query. These are expensive and do not scale well. To fix this, you must ensure the data required for the query exists in a container where the userID is the partition key.
1. The Optimal Solution: Change Feed + Shadow Container
The most efficient way to handle this with minimal overhead is to create a third "shadow" container or a materialized view.
*-> 2. Alternative: The "In-Partition" User Container
If you want to avoid a third container, you can store "User Profile" items and "Blog Summary" items in the same User container.
Partition Key: /userID
Items:
The User profile (Type: Profile)
Multiple "Post Summary" items (Type: PostSummary)
Query: SELECT * FROM c WHERE c.partitionKey = 'user123' AND c.type = 'PostSummary' Pros: Lowest possible RU; only two containers to manage.
Reference:
https://stackoverflow.com/questions/76622408/cosmos-db-differentiation-strategy-when-storing-multiple-document-types-in-a-sin
質問 # 138
You have an Azure Cosmos DB container named owners. Each item in owners represents an owner and their pets. The following is a sample of the JSON
You are writing a query that will retrieve the average age of each pet owned by each owner, il the pet is older than two years.
How should you complete the query? To answer, drag the appropriate values to the correct targets. Each value may be used once, more than once, or not at all. You may need to drag the split bar between panes 01 scroll to view content.
NOTE: Each correct selection is worth one point.
正解：
解説：
質問 # 139
You have a container in an Azure Cosmos DB for NoSQL account that stores data about orders. The following is a sample of an order document.
Documents are up to 2 KB.
You plan to receive one million orders daily.
Customers will frequently view then past order history.
You are the evaluating whether to use orderDate as the partition key.
What are two effects of using orderDateas the partition key? Each correct answer presents a complete solution.
NOTE: Each correct selection is worth one point.
正解：B、D
質問 # 140
You configure a backup for an Azure Cosmos DB for NoSQL account as shown in the following exhibit.
Use the drop-down menus to select the answer choice that completes each statement based on the information presented in the graphic.
NOTE: Each correct selection is worth one point.
正解：
解説：
Explanation:
Box 1 = The current backup policy provides protection for: 2 Hours Azure Cosmos DB automatically takes backups of your data at regular intervals. The backup interval and the retention period can be configured from the Azure portal. You can also choose between two backup modes: periodic backup mode and continuous backup mode. Periodic backup mode is the default mode for all existing accounts and it takes a full backup of your database every 4 hours by default. Continuous backup mode is a new mode that allows you to restore to any point of time within either 7 or 30 days1.
For your scenario, based on the exhibit, you have configured a backup for an Azure Cosmos DB for NoSQL account using the periodic backup mode with a backup interval of 1 hour and a retention period of 2 hours.
This means that Azure Cosmos DB will take a full backup of your database every hour and keep only the latest two backups. Therefore, the current backup policy provides protection for 2 hours.
Box 2: In case of emergency, you must (answer choice) to restore the backup = create a support ticket Azure Cosmos DB automatically takes backups of your data at regular intervals. You can configure the backup interval and the retention period from the Azure portal. You can also choose between two backup modes:
periodic backup mode and continuous backup mode. Periodic backup mode is the default mode for all existing accounts and it takes a full backup of your database every 4 hours by default. Continuous backup mode is a new mode that allows you to restore to any point of time within either 7 or 30 days1.
For your scenario, based on the exhibit, you have configured a backup for an Azure Cosmos DB for NoSQL account using the periodic backup mode with a backup interval of 1 hour and a retention period of 2 hours.
This means that Azure Cosmos DB will take a full backup of your database every hour and keep only the latest two backups. In case of emergency, you must create a support ticket to restore the backup. This is the answer to your question.
To restore data from a periodic backup, you need to create a support request with Azure Cosmos DB team and provide the following information:
* The name of your Azure Cosmos DB account
* The name of the database or container that you want to restore
* The date and time (in UTC) that you want to restore from
* The name of the target Azure Cosmos DB account where you want to restore the data
* The name of the target resource group where you want to restore the data The Azure Cosmos DB team will then initiate the restore process and notify you when it is completed2.
質問 # 141
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