Download Microsoft 70-762 Exam Latest Question Answers - Updated 70-762 Braindumps

Question No : 1

Note: This question is part of a series of questions that present the same scenario. Each question in this series contains a unique solution. Determine whether the solution meets the stated goals. The Account table was created by using the following Transact-SQL statement:

There are more than 1 billion records in the Account table. The Account Number column uniquely identifies each account. The ProductCode column has 100 different values. The values are evenly distributed in the table. Table statistics are refreshed and up to date. You frequently run the following Transact-SQL SELECT statements:

You must avoid table scans when you run the queries.
You need to create one or more indexes for the table.
Solution: You run the following Transact-SQL statement:
CREATE NONCLUSTERED INDEX IX_Account_ProductCode ON Account(ProductCode);
Does the solution meet the goal?

A. Yes
B. No

Answer: A
Explanation:
References: https://msdn.microsoft.com/en-za/library/ms189280.aspx

Question No : 2

Note: this question is part of a series of questions that use the same or similar answer choices. An answer choice may be correct for more than one question in the series. Each question is independent of the other questions in the series. Information and details provided in a question apply only to that question. You are developing and application to track customer sales. You need to create an object that meets the following requirements:

- Run managed code packaged in an assembly that was created in the Microsoft.NET Framework and uploaded in Microsoft SQL Server.

- Run written a transaction and roll back if a future occurs.

- Run when a table is created or modified.

What should you create?

A. extended procedure

B. CLR procedure

C. user-defined procedure

D. DML trigger

E. scalar-valued function

F. table-valued function

G. DDL trigger

Answer: B

Explanation:

The common language runtime (CLR) is the heart of the Microsoft .NET Framework and provides the execution environment for all .NET Framework code. Code that runs within the CLR is referred to as managed code. With the CLR hosted in Microsoft SQL Server (called CLR integration), you can author stored procedures, triggers, user-defined functions, user-defined types, and user-defined aggregates in managed code. Because managed code compiles to native code prior to execution, you can achieve significant performance increases in some scenarios.

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Question No : 3

Note: This question is part of a series of questions that present the same scenario. Each question in this series contains a unique solution. Determine whether the solution meets the stated goals. You are developing a new application that uses a stored procedure. The stored procedure inserts thousands of records as a single batch into the Employees table. Users report that the application response time has worsened since the stored procedure was updated. You examine disk-related performance counters for the Microsoft SQL Server instance and observe several high values that include a disk performance issue. You examine wait statistics and observe an unusually high WRITELOG value. You need to improve the application response time. Solution: You replace the stored procedure with a user-defined function.

Does the solution meet the goal?

A. Yes

B. No

Answer: B

Explanation:

References: https://msdn.microsoft.com/en-us/library/ms345075.aspx

Question No : 4

You are analyzing the performance of a database environment. Applications that access the database are experiencing locks that are held for a large amount of time. You are experiencing isolation phenomena such as dirty, non repeatable and phantom reads. You need to identify the impact of specific transaction isolation levels on the concurrency and consistency of data. What are the consistency and concurrency implications of each transaction isolation level? To answer, drag the appropriate isolation levels to the correct locations. Each isolation level may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.

Answers :

Expiation :

Read Uncommitted (aka dirty read): A transaction T1executing under this isolation level can access data changed by concurrent transaction(s).

Pros:No read locks needed to read data (i.e. no reader/writer blocking). Note, T1 still takes transaction duration locks for any data modified.

Cons: Data is not guaranteed to be transactionally consistent.

Read Committed: A transaction T1 executing under this isolation level can only access committed data.

Pros: Good compromise between concurrency and consistency.

Cons: Locking and blocking. The data can change when accessed multiple times within the same transaction.

Repeatable Read: A transaction T1 executing under this isolation level can only access committed data with an additional guarantee that any data read cannot change (i.e. it is repeatable) for the duration of the transaction.

Pros: Higher data consistency.

Cons: Locking and blocking. The S locks are held for the duration of the transaction that can lower the concurrency. It does not protect against phantom rows.

Serializable: A transaction T1 executing under this isolation level provides the highest data consistency including elimination of phantoms but at the cost of reduced concurrency. It prevents phantoms by taking a range lock or table level lock if range lock can’t be acquired (i.e. no index on the predicate column) for the duration of the transaction.

Pros: Full data consistency including phantom protection.

Cons: Locking and blocking. The S locks are held for the duration of the transaction that can lower the concurrency.

References: https://blogs.msdn.microsoft.com/sqlcat/2011/02/20/concurrency-seriesbasics-of-transaction-isolation-levels/

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Question No : 5

Note: This question is part of a series of questions that use the same scenario. For your convenience, the scenario is repeated in each question. Each question presents a different goal and answer choices, but the text of the scenario is exactly the same in each question in this series. You have a database that contains the following tables: BlogCategory, BlogEntry, ProductReview, Product, and SalesPerson. The tables were created using the following Transact SQL statements:

You must modify the ProductReview Table to meet the following requirements:

* The table must reference the ProductID column in the Product table

* Existing records in the ProductReview table must not be validated with the Product table.

* Deleting records in the Product table must not be allowed if records are referenced by the ProductReview table.

* Changes to records in the Product table must propagate to the ProductReview table.

You also have the following database tables: Order, ProductTypes, and SalesHistory, The transact-SQL statements for these tables are not available. 

You must modify the Orders table to meet the following requirements:

* Create new rows in the table without granting INSERT permissions to the table.

* Notify the sales person who places an order whether or not the order was completed.

You must add the following constraints to the SalesHistory table:

* a constraint on the SaleID column that allows the field to be used as a record identifier

* a constant that uses the ProductID column to reference the Product column of the ProductTypes table

* a constraint on the CategoryID column that allows one row with a null value in the column

* a constraint that limits the SalePrice column to values greater than four Finance department users must be able to retrieve data from the SalesHistory table for sales persons where the value of the SalesYTD column is above a certain threshold. You plan to create a memory-optimized table named SalesOrder. The table must meet the following requirements:

* The table must hold 10 million unique sales orders.

* The table must use checkpoints to minimize I/O operations and must not use transaction logging.

* Data loss is acceptable. Performance for queries against the SalesOrder table that use Where clauses with exact equality operations must be optimized.You need to create a stored procedure named spDeleteCategory to delete records in the database. The stored procedure must meet the following requirements:

* Delete records in both the BlogEntry and BlogCategory tables where CategoryId equals parameter @CategoryId.

* Avoid locking the entire table when deleting records from the BlogCategory table.

* If an error occurs during a delete operation on either table, all changes must be rolled back, otherwise all changes should be committed. How should you complete the procedure? To answer, select the appropriate Transact-SQL segments in the answer area.

Answers : 

Expiation:

Box 1: SET TRANSACTION ISOLATION LEVEL READ COMMITTED

You can minimize locking contention while protecting transactions from dirty reads of uncommitted data modifications by using either of the following:

* The READ COMMITTED isolation level with the READ_COMMITTED_SNAPSHOT database option set ON.

* The SNAPSHOT isolation level.

With ROWLOCK we should use READ COMMITTED

Box 2: ROWLOCK

Requirement: Avoid locking the entire table when deleting records from the BlogCategory table ROWLOCK specifies that row locks are taken when page or table locks are ordinarily taken. When specified in transactions operating at the SNAPSHOT isolation level, row locks are not taken unless ROWLOCK is combined with other table hints that require locks,

such as UPDLOCK and HOLDLOCK.

Box 3: COMMIT

Box 4: ROLLBACK

Question No : 6

Background

You have a database named HR1 that includes a table named Employee. You have several read-only, historical reports that contain regularly changing totals. The reports use multiple queries to estimate payroll expenses. The queries run concurrently. Users report that the payroll estimate reports do not always run. You must monitor the database to identify issues that prevent the reports from running. You plan to deploy the application to a database server that supports other applications. You must minimize the amount of storage that the database requires. Employee Table You use the following Transact-SQL statements to create, configure, and populate the Employee table:

Application

You have an application that updates the Employees table. The application calls the following stored procedures simultaneously and asynchronously:

- UspA: This stored procedure updates only the EmployeeStatus column.

- UspB: This stored procedure updates only the EmployeePayRate column.

The application uses views to control access to data. Views must meet the following requirements:

- Allow user access to all columns in the tables that the view accesses.

- Restrict updates to only the rows that the view returns. Exhibit

You view the Deadlock Graph as shown in the exhibit. (Click the Exhibit button.) Use the drop-down menus to select the answer choice that answers each question based on the information presented in the graphic.

NOTE: Each correct selection is worth one point.

Answers :

Explanation:

References: https://msdn.microsoft.com/en-us/library/ms186736.aspx

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Question No : 7

You have a trigger named CheckTriggerCreation that runs when a user attempts to create a trigger. The CheckTriggerCreation trigger was created with the ENCRYPTION option and additional proprietary business logic. You need to prevent users from running the ALTER and DROP statements or the sp_tableoption stored procedure. Which three Transact-SQL segments should you use to develop the solution? To answer, move the appropriate Transact-SQL segments from the list of Transact-SQL segments to the answer area and arrange them in the correct order.

Answer:

Question No : 8

Note: this question is part of a series of questions that use the same or similar answer choices. An answer choice may be correct for more than one question in the series. Each question is independent of the other questions in the series. Information and details provided in a question apply only to that question.

You are developing an application to track customer sales.

You need to create a database object that meets the following requirements:

- Launch when table data is modified.

- Evaluate the state a table before and after a data modification and take action based on the difference.

- Prevent malicious or incorrect table data operations.

- Prevent changes that violate referential integrity by cancelling the attempted data modification.

- Run managed code packaged in an assembly that is created in the Microsoft.NET Framework and located into Microsoft SQL Server.

What should you create?

A. extended procedure

B. CLR procedure

C. user-defined procedure

D. DML trigger

E. scalar-valued function

F. table-valued function

Answer: B

Explanation:

You can create a database object inside SQL Server that is programmed in an assembly created in the Microsoft .NET Framework common language runtime (CLR). Database objects that can leverage the rich programming model provided by the CLR include DML triggers, DDL triggers, stored procedures, functions, aggregate functions, and types. Creating a CLR trigger (DML or DDL) in SQL Server involves the following steps: Define the trigger as a class in a .NETFramework-supported language. For more information about how to program triggers in the CLR, see CLR Triggers. Then, compile the class to build an assembly in the .NET Framework using the appropriate language

compiler. Register the assembly in SQL Server using the CREATE ASSEMBLY statement. For more

information about assemblies in SQL Server, see Assemblies (Database Engine). Create the trigger that references the registered assembly.

References: https://msdn.microsoft.com/en-us/library/ms179562.aspx

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Question No : 9

Note: This question is part of a series of questions that present the same scenario. Each question in the series contains a unique solution. Determine whether the solution meets the stated goals.

You have a database that contains a table named Employees. The table stores information about the employees of your company.

You need to implement and enforce the following business rules:

- Limit the values that are accepted by the Salary column.

- Prevent salaries less than $15,000 and greater than $300,000 from being entered.

- Determine valid values by using logical expressions.

- Do not validate data integrity when running DELETE statements.

Solution: You implement a FOR UPDATE trigger on the table.

Does the solution meet the goal?

A. Yes

B. No

Answer: B

Explanation:

References: http://stackoverflow.com/questions/16081582/difference-between-for-updateof-and-for-update

Question No : 10

You are analyzing the memory usage of a Microsoft SQL Server instance.

You need to obtain the information described on the following table.

Which performance counter should you use for each requirement? To answer, drag the appropriate performance counters to the correct requirements. Each performance counter may be used once, more than once or not at all. You may need to drag the split bat between panes or scroll to view content.

NOTE: Each correct selection is worth one point.

Answer:

Explanation:

 Requirement1: SQL Server: Memory Manager: Total Server Memory (KB)

This counter specifies the amount of memory the server has committed using the memory manager.

Requirement2: SQL Server: Memory Manager: Granted Workspace Memory (KB) 

Specifies the total amount of memory currently granted to executing processes, such as hash, sort, bulk copy, and index creation operations.

Requirement3: Process: working Set

Each time a process is created, it reserves the minimum working set size for the process. The virtual memory manager attempts to keep enough memory for the minimum working set resident when the process is active, but keeps no more than the maximum size.

References:

https://msdn.microsoft.com/en-us/library/ms190924.aspx

https://blogs.technet.microsoft.com/askperf/2007/05/18/sql-and-the-working-set/

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