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NEW QUESTION: 1
You are developing a database reporting solution for a table that contains 900 million rows and is 103 GB.
The table is updated thousands of times a day, but data is not deleted.
The SELECT statements vary in the number of columns used and the amount of rows retrieved.
You need to reduce the amount of time it takes to retrieve data from the table. The must prevent data duplication.
Which indexing strategy should you use?
A. a clustered index for the table and nonclustered indexes for nonkey columns
B. a nonclustered index for each column in the table
C. a hash index for the table
D. a clustered columnstore index for the table
Answer: D
Explanation:
Columnstore indexes are the standard for storing and querying large data warehousing fact tables. It uses column-based data storage and query processing to achieve up to 10x query performance gains in your data warehouse over traditional row-oriented storage.
A clustered columnstore index is the physical storage for the entire table.
Generally, you should define the clustered index key with as few columns as possible.
A nonclustered index contains the index key values and row locators that point to the storage location of the table data. You can create multiple nonclustered indexes on a table or indexed view. Generally, nonclustered indexes should be designed to improve the performance of frequently used queries that are not covered by the clustered index.
References: https://docs.microsoft.com/en-us/sql/relational-databases/indexes/columnstore-indexes- overview?view=sql-server-2017
NEW QUESTION: 2
AWSインフラストラクチャ全体が1つのAmazon VPC内にあります。リージョンのアベイラビリティーゾーン(AZ)AのAmazonインスタンスで実行されているインフラストラクチャ監視アプリケーションと、AZで実行されている別のアプリケーションインスタンスがあります
B.監視アプリケーションは、ICMP pingを使用して、アプリケーションをホストしているインスタンスのネットワーク到達可能性を確認する必要があります。
これらのインスタンスのセキュリティグループを構成して、ICMP pingが監視インスタンスからアプリケーションインスタンスにのみ通過することのみを許可することはできますか?もしそうなら?
A. はい、監視インスタンスとアプリケーションインスタンスの両方が同じセキュリティグループの一部である必要があり、そのセキュリティグループはインバウンドICMPを許可する必要があります
B. はい、ICMPは接続指向のプロトコルではないため、監視インスタンスのセキュリティグループとアプリケーションインスタンスのセキュリティグループの両方で、受信と送信の両方のICMP pingパケットを許可する必要があります
C. いいえ、2つの異なるAZの2つのインスタンスは、ICMP pingを介して互いに直接通信できません。これは、そのプロトコルがサブネット(ブロードキャスト)の境界を越えて許可されていないためです。
D. はい、モニタリングインスタンスのセキュリティグループはアウトバウンドICMPを許可する必要があり、アプリケーションインスタンスのセキュリティグループはインバウンドICMPを許可する必要があります
Answer: D
Explanation:
説明
ICMPは接続指向のプロトコルではありませんが、セキュリティグループはステートフルです。 「セキュリティグループはステートフルです-許可されたインバウンドトラフィックへの応答は、アウトバウンドルールに関係なくアウトバウンドに流れることが許可され、その逆も同様です。」
参照:
NEW QUESTION: 3
What is the approximate time difference for a client to perform an intracontroller roam compared to an intercontroller roam?
A. 1 ms
B. 10 ms
C. 30 ms
D. 20 ms
Answer: B
NEW QUESTION: 4
How can you specify a splash screen that must be shown during the startup of your Microsoft Silverlight application?
A. By creating a 480x800 image named splashscreen.png, adding it to your project, and setting the build action as resource
B. By creating an application page named Splash.xaml, and adding it to your splash screen content
C. By creating a 100x100 icon named splash.ico, and adding it to your project as content
D. By creating a 480x800 image named splashscreenimage.jpg, and adding it to your project as content
Answer: D