Ucertify offers free demo for 70-762 exam. "Developing SQL Databases (beta)", also known as 70-762 exam, is a Microsoft Certification. This set of posts, Passing the Microsoft 70-762 exam, will help you answer those questions. The 70-762 Questions & Answers covers all the knowledge points of the real exam. 100% real Microsoft 70-762 exams and revised by experts!
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Q11. 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 independent of the other questions in this series. Information and details provided in a question apply only to that question.
You are a database developer for a company. The company has a server that has multiple physical disks. The disks are not part of a RAID array. The server hosts three Microsoft SQL Server instances. There are many SQL jobs that run during off-peak hours.
You must monitor the SQL Server instances in real time and optimize the server to maximize throughput, response time, and overall SQL performance.
What should you do?
A. A. Create asys.dm_os_waiting_tasks query.
B. Create a sys.dm_exec_sessions query.
C. Create aPerformance Monitor Data Collector Set.
D. Create a sys.dm_os_memory_objects query.
E. Create a sp_configure ‘max server memory’ query.
F. Create a SQL Profiler trace.
G. Create a sys.dm_os_wait_stats query.
H. Create an Extended Event.
Answer: B
Explanation:
sys.dm_exec_sessions returns one row per authenticated session on SQL Server. sys.dm_exec_sessions is a server-scope view that shows information about all active user connections and internal tasks. This information includes client version, client program name, client login time, login user, current session setting, and more. Use sys.dm_exec_sessions to first view the current system load and to identify a session of interest, and then learn more information about that session by using other dynamic management views or dynamic management functions.
Examples of use include finding long-running cursors, and finding idle sessions that have open transactions.
Q12. 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 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 CLUSTERED INDEX PK_Account ON Account(ProductCode); Does the solution meet the goal?
A. Yes
B. No
Answer: B
Explanation:
We need an index on the productCode column as well. References:https://msdn.microsoft.com/en-us/library/ms190457.aspx
Q13. 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: 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-update-of-and-for-update
Q14. DRAG DROP
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 named DB1 that contains the following tables: Customer, CustomerToAccountBridge, and CustomerDetails. The three tables are part of the Sales schema. The database also contains a schema named Website. You create the Customer table by running the following Transact-SQL statement:
The value of the CustomerStatus column is equal to one for active customers. The value of the Account1Status and Account2Status columns are equal to one for active accounts. The
following table displays selected columns and rows from the Customer table.
You plan to create a view named Website.Customer and a view named Sales.FemaleCustomers.
Website.Customer must meet the following requirements:
1. Allow users access to the CustomerName and CustomerNumber columns for active customers.
2. Allow changes to the columns that the view references. Modified data must be visible through the view.
3. Prevent the view from being published as part of Microsoft SQL Server replication. Sales.Female.Customers must meet the following requirements:
1. Allow users access to the CustomerName, Address, City, State and PostalCode columns.
2. Prevent changes to the columns that the view references.
3. Only allow updates through the views that adhere to the view filter.
You have the following stored procedures: spDeleteCustAcctRelationship and spUpdateCustomerSummary. The spUpdateCustomerSummary stored procedure was created by running the following Transacr-SQL statement:
The following table displays a selected columns and rows from the Customer table. Thr value of the CustomerStatus column is equal to one for active customers. The value of the Account1Status and Account2Status columns are equal to one for active accounts.
You run the spUpdateCustomerSummary stored procedure to make changes to customer account summaries. Other stored procedures call the spDeleteCustAcctRelationship to delete records from the CustomerToAccountBridge table.
Users report that the following SELECT statement statement takes a long time to complete:
You need to create an index that meets the following requirements:
1. Improve the performance of the SELECT statement.
2. requires minimum index key size.
3. Only contains active customers.
4. Makes no change to the existing primary key.
5. Contains all of the columns required by the SELECT statement.
Which three Transact_SQL segments should you use to develop the solution? To answer, move the appropriate code blocks from the list of code blocks to the answer area and arrange them in the correct order.
Answer:
Explanation:
Box 1: Clustered Index
With the same size of keys, the nonclustered indexes need more space than clustered
indexes.
Box 2, Box 3:
Include the CustomerStatus column in the index, and only when CustomerStatusnot equal to 1 (the active customers).
References:http://www.sqlserverlogexplorer.com/overview-of-cluster-and-noncluster-index/
Q15. Note: The 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 question in the series. Information and details provided in a question apply only to that question.
You have a database named DB1. The database does not use a memory-optimized filegroup. The database contains a table named Table1. The table must support the following workloads:
You need to add the most efficient index to support the new OLTP workload, while not deteriorating the existing Reporting query performance.
What should you do?
A. Create a clustered index on the table.
B. Create a nonclustered index on the table.
C. Create a nonclustered filtered index on the table.
D. Create a clusteredcolumnstore index on the table.
E. Create a nonclustered columnstore index on the table.
F. Create a hash index on the table.
Answer: C
Explanation:
A filtered index is an optimized nonclustered index, especially suited to cover queries that
select from awell-defined subset of data. It uses a filter predicate to index a portion of rows in the table. A well-designed filtered index can improve query performance, reduce index maintenance costs, and reduce index storage costs compared with full-table indexes.
References:https://technet.microsoft.com/en-us/library/cc280372(v=sql.105).aspx
Q16. HOTSPOT
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 named Sales that contains the following database tables: Customer, Order, and Products. The Products table and the Order table are shown in the following diagram.
The customer table includes a column that stores the data for the last order that the customer placed.
You plan to create a table named Leads. The Leads table is expected to contain approximately 20,000 records. Storage requirements for the Leads table must be minimized.
You need to create triggers that meet the following requirements:
In the table below, identify the trigger types that meet the requirements.
NOTE: Make only selection in each column. Each correct selection is worth one point.
Answer:
Explanation:
INSTEAD OF INSERT triggers can be defined on a view or table to replace the standard action of the INSERT statement.
AFTER specifies that the DML trigger is fired only when all operationsspecified in the triggering SQL statement have executed successfully.
References:https://technet.microsoft.com/en-us/library/ms175089(v=sql.105).aspx
Q17. 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 named DB1 that contains the following tables: Customer, CustomerToAccountBridge, and CustomerDetails. The three tables are part of the Sales schema. The database also contains a schema named Website. You create the Customer table by running the following Transact-SQL statement:
The value of the CustomerStatus column is equal to one for active customers. The value of
the Account1Status and Account2Status columns are equal to one for active accounts. The following table displays selected columns and rows from the Customer table.
You plan to create a view named Website.Customer and a view named Sales.FemaleCustomers.
Website.Customer must meet the following requirements:
1. Allow users access to the CustomerName and CustomerNumber columns for active customers.
2. Allow changes to the columns that the view references. Modified data must be visible through the view.
3. Prevent the view from being published as part of Microsoft SQL Server replication. Sales.Female.Customers must meet the following requirements:
1. Allow users access to the CustomerName, Address, City, State and PostalCode columns.
2. Prevent changes to the columns that the view references.
3. Only allow updates through the views that adhere to the view filter.
You have the following stored procedures: spDeleteCustAcctRelationship and spUpdateCustomerSummary. The spUpdateCustomerSummary stored procedure was created by running the following Transacr-SQL statement:
You run the spUpdateCustomerSummary stored procedure to make changes to customer
account summaries. Other stored procedures call the spDeleteCustAcctRelationship to delete records from the CustomerToAccountBridge table.
You must update the design of the Customer table to meet the following requirements.
1. You must be able to store up to 50 accounts for each customer.
2. Users must be able to retrieve customer information by supplying an account number.
3. Users must be able to retrieve an account number by supplying customer information. You need to implement the design changes while minimizing data redundancy.
What should you do?
A. Splitthe table into three separate tables. Include the AccountNumber and CustomerID columns in the first table. Include the CustomerName and Gender columns in the second table. Include the AccountStatus column in the third table.
B. Split the table into two separate tables. Include AccountNumber, CustomerID, CustomerName and Gender columns in the first table. Include the AccountNumber and AccountStatus columns in the second table.
C. Split the table into two separate tables, Include the CustomerID and AccountNumber columns in the first table. Include the AccountNumber, AccountStatus, CustomerName and Gender columns in the second table.
D. Split the table into two separate tables, Include the CustomerID, CustomerName and Gender columns in the first table. IncludeAccountNumber, AccountStatus and CustomerID columns in the second table.
Answer: D
Explanation:
Two tables is enough.CustomerID must be in both tables.
Q18. HOTSPOT
You are analyzing the performance of a database environment.
You need to find all unused indexes in the current database.
How should you complete the Transact-SQL statement? To answer, select the appropriate Transact-SQL segments in the answer area.
Answer:
Explanation:
Example: Following query helps you to find all unused indexes within database using sys.dm_db_index_usage_stats DMV.
-- Ensure a USE statement has been executed first. SELECT u.*
FROM [sys].[indexes] i
INNER JOIN[sys].[objects] o ON (i.OBJECT_ID = o.OBJECT_ID)
LEFT JOIN [sys].[dm_db_index_usage_stats] u ON (i.OBJECT_ID = u.OBJECT_ID) AND i.[index_id] = u.[index_id]
AND u.[database_id] = DB_ID() --returning the database ID of the current database WHERE o.[type] <>'S' --shouldn't be a system base table
AND i.[type_desc] <> 'HEAP' AND i.[name] NOT LIKE 'PK_%'
AND u.[user_seeks] + u.[user_scans] + u.[user_lookups] = 0 AND u.[last_system_scan] IS NOT NULL
ORDER BY 1 ASC
References:https://basitaalishan.com/2012/06/15/find-unused-indexes-using-sys-dm_db_index_usage_stats/
Q19. HOTSPOT
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 named Sales that contains the following database tables: Customer, Order, and Products. The Products table and the Order table are shown in the following diagram.
The customer table includes a column that stores the data for the last order that the customer placed.
You plan to create a table named Leads. The Leads table is expected to contain approximately 20,000 records. Storage requirements for the Leads table must be minimized.
You need to implement a stored procedure that deletes a discontinued product from the Products table. You identify the following requirements:
What should you do? To answer, select the appropriate Transact-SQL segments in the answer area.
Answer:
Explanation:
Using TRY...CATCH inTransact-SQL
Errors in Transact-SQL code can be processed by using a TRY…CATCH construct. TRY…CATCH can use the following error function to capture error information:
ERROR_MESSAGE() returns the complete text of the error message. The text includes the
values supplied for any substitutable parameters such as lengths, object names, or times. References:https://technet.microsoft.com/en-us/library/ms179296(v=sql.105).aspx
Q20. 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:
Solution: You implement cascading referential integrity constraints on the table. Does the solution meet the goal?
A. Yes
B. No
Answer: A
Explanation:
References: https://technet.microsoft.com/en-us/library/ms186973(v=sql.105).aspx