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マイクロソフト 70-461 最新受験攻略の内容を見せる

2017-05-20 15:52:46 | 日記

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70-461試験番号:70-461 試験対策
試験科目:「Querying Microsoft SQL Server 2012/2014」
最近更新時間:2017-05-19
問題と解答:165

>> 70-461 試験対策


 

NO.1 You are designing a table for a SQL Server database. The table uses horizontal partitioning.
You have the following requirements:
You need to choose the appropriate data type for the key value.
What should you do?
A. Use the NEWSEQUENTIALID function to create a unique identifier.
B. Use the NEWID function to create a unique identifier.
C. Generate a random value that uses the bigint datatype.
D. Generate a random value that uses the char(16) data type.
Answer: A
Explanation:
Horizontal partitioning divides a table into multiple tables. Each table then contains the same number
of columns, but fewer rows. For example, a table that contains 1 billion rows could be partitioned
horizontally into 12 tables, with each smaller table representing one month of data for a specific
year. Any queries requiring data for a specific month only reference the appropriate table.
NEWSEQUENTIALID creates a GUID that is greater than any GUID previously generated by this
function on a specified computer since Windows was started. After restarting
Windows, the GUID can start again from a lower range, but is still globally unique. When a
GUID column is used as a row identifier, using NEWSEQUENTIALID can be faster than using the
NEWID function. This is because the NEWID function causes random activity and uses fewer cached
data pages. Using NEWSEQUENTIALID also helps to completely fill the data and index pages.
References:https://msdn.microsoft.com/en-us/library/ms189786.aspx

NO.2 You administer several Microsoft SQL Server 2012 database servers. Merge replication has been
configured for an application that is distributed across offices throughout a wide area network
(WAN). Many of the tables involved in replication use the XML and varchar (max) data types.
Occasionally, merge replication fails due to timeout errors. You need to reduce the occurrence of
these timeout errors. What should you do?
A. Create a snapshot publication, and reconfigure the problem subscribers to use the snapshot
publication.
B. Set the Remote Connection Timeout on the Publisher to 0.
C. Change the Merge agent on the problem subscribers to run continuously.
D. Set the Merge agent on the problem subscribers to use the slow link agent profile.
Answer: D

70-461 学校   

NO.3 You are a database developer for an application hosted on a Microsoft SQL Server 2012
server.
The database contains two tables that have the following definitions:
Global customers place orders from several countries.
You need to view the country from which each customer has placed the most orders.
Which Transact-SQL query do you use?
A. SELECT c.CustomerID, c.CustomerName, o.ShippingCountry
FROM Customer c
INNER JOIN
(SELECT CustomerID, ShippingCountry,
RANK() OVER (PARTITION BY CustomerID
ORDER BY COUNT(OrderAmount) DESC) AS Rnk
FROM Orders
GROUP BY CustomerID, ShippingCountry) AS o
ON c.CustomerID = o.CustomerID
WHERE o.Rnk = 1
B. SELECT c.CustomerID, c.CustomerName, o.ShippingCountry
FROM
(SELECT c.CustomerID, c.CustomerName, o.ShippingCountry,
RANK() OVER (PARTITION BY CustomerID
ORDER BY COUNT(o.OrderAmount) ASC) AS Rnk
FROM Customer c
INNER JOIN Orders o
ON c.CustomerID = o.CustomerID
GROUP BY c.CustomerID, c.CustomerName, o.ShippingCountry) cs
WHERE Rnk = 1
C. SELECT c.CustomerID, c.CustomerName, o.ShippingCountry
FROM Customer c
INNER JOIN
(SELECT CustomerID, ShippingCountry,
RANK() OVER (PARTITION BY CustomerID
ORDER BY OrderAmount DESC) AS Rnk
FROM Orders
GROUP BY CustomerID, ShippingCountry) AS o
ON c.CustomerID = o.CustomerID
WHERE o.Rnk = 1
D. SELECT c.CustomerID, c.CustomerName, o.ShippingCountry
FROM Customer c
INNER JOIN
(SELECT CustomerID, ShippingCountry,
COUNT(OrderAmount) DESC) AS OrderAmount
FROM Orders
GROUP BY CustomerID, ShippingCountry) AS o
ON c.CustomerID = o.CustomerID
ORDER BY OrderAmount DESC
Answer: A

NO.4 You develop a Microsoft SQL Server 2012 database. The database is used by two web
applications that access a table named Products.
You want to create an object that will prevent the applications from accessing the table directly while
still providing access to the required data.
You need to ensure that the following requirements are met:
* Future modifications to the table definition will not affect the applications' ability to access data.
* The new object can accommodate data retrieval and data modification.
You need to achieve this goal by using the minimum amount of changes to the existing applications.
What should you create for each application?
A. table-valued functions
B. views
C. table partitions
D. stored procedures
Answer: B

70-461 模擬   


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