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NEW QUESTION: 1
あるチームが、3つのアベイラビリティーゾーンAZ-a、AZ-b、AZ-cを持つAWSリージョンで新しいWebアプリケーションを開発しました。このアプリケーションはフォールトトレラントでなければならず、少なくとも6つのAmazon EC2インスタンスが常に実行されている必要があります。アプリケーションが実行を継続できるように、アプリケーションは単一のアベイラビリティーゾーンへの接続の喪失を許容する必要があります。
どの構成がこれらの要件を満たしますか？ （2つ選択）
A. 3つのEC2インスタンスがあるAZ-a、3つのEC2インスタンスがあるAZ-b、およびEC2インスタンスがないAZ-c。
B. 6個のEC2インスタンスがあるAZ-a、6個のEC2インスタンスがあるAZ-b、およびEC2インスタンスがないAZ-c。
C. 2つのEC2インスタンスを持つAZ-b、および2つのEC2インスタンスを持つAZ-c。
D. 3つのEC2インスタンスを持つAZ-b、3つのEC2インスタンスを持つAZ-b、および3つのEC2インスタンスを持つAZ-c。
E. AZ-aが4つのEC2インスタンス、AZ-bが2つのEC2インスタンス、そしてAZ-cが2つのEC2インスタンスを持つ。
Answer: C,D
NEW QUESTION: 2
You have a Microsoft Azure SQL data warehouse that has a fact table named FactOrder. FactOrder contains three columns named CustomerID, OrderID, and OrderDateKey. FactOrder is hash distributed on CustomerID. OrderID is the unique identifier for FactOrder. FactOrder contains 3 million rows.
Orders are distributed evenly among different customers from a table named dimCustomers that contains
2 million rows.
You often run queries that join FactOrder and dimCustomers by selecting and grouping by the OrderDateKey column.
You add 7 million rows to FactOrder. Most of the new records have a more recent OrderDateKey value than the previous records.
You need to reduce the execution time of queries that group on OrderDateKey and that join dimCustomers and FactOrder.
What should you do?
A. Change the distribution for the FactOrder table to be based on OrderID
B. Update the statistics for the OrderDateKey column
C. Change the distribution for the dimCustomers table to OrderDateKey
D. Change the distribution for the FactOrder table to round robin
Answer: B
Explanation:
Explanation/Reference:
Updating statistics
One best practice is to update statistics on date columns each day as new dates are added. Each time new rows are loaded into the data warehouse, new load dates or transaction dates are added. These change the data distribution and make the statistics out of date.
References: https://docs.microsoft.com/en-us/azure/sql-data-warehouse/sql-data-warehouse-tables- statistics
NEW QUESTION: 3
OSI Reference Model () function is the combination of bits into bytes, then the combination of framing bytes to provide media access and so on.
A. Network Layer
B. Application layer
C. session layer
D. Data Link Layer
Answer: D
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