Online Access Free 70-762 Exam Questions

You use Microsoft SQL Server Profile to evaluate a query named Query1. The Profiler report indicates the following issues:
* At each level of the query plan, a low total number of rows are processed.
* The query uses many operations. This results in a high overall cost for the query.
You need to identify the information that will be useful for the optimizer.
What should you do?

• A.Create one Extended Events session with the sqlserver.error_reported event added.
• B.Create one Extended Events session with the sqlserver.missing_column_statistics event added.
• C.Start a SQL Server Profiler trace for the event class Soft Warnings in the Errors and Warnings event category.
• D.Start a SQL Server Profiler trace for the event class Performance statistics in the Performance event category.

You have a memory-optimized table named Customer. The table is accessed by a stored procedure named ManageCustomer.
The database was created in Microsoft SQL Server 2014. A backup and restore operation was used to move the database to SQL Server 2016.
You have performance issues with the stored procedure.
You need to resolve the performance issues and ensure the table statistics are updated automatically.
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.

Correct Answer:

Explanation

Step 1: ALTER DATABASE CURRENT SET COMPATIBILITY_LEVEL
Sets certain database behaviors to be compatible with the specified version of SQL Server.
Syntax:
ALTER DATABASE database_name
SET COMPATIBILITY_LEVEL = { 150 | 140 | 130 | 120 | 110 | 100 | 90 }
Step 2: UPDATE STATISTICS Customers
UPDATE STATISTICS updates query optimization statistics on a table or indexed view.
Step 3: EXEC sp_recompile N' 'Manage_customer'
sp_recompile causes stored procedures, triggers, and user-defined functions to be recompiled the next time that they are run. It does this by dropping the existing plan from the procedure cache forcing a new plan to be created the next time that the procedure or trigger is run References:
https://docs.microsoft.com/en-us/sql/t-sql/statements/alter-database-transact-sql-compatibility-level
https://docs.microsoft.com/en-us/sql/t-sql/statements/update-statistics-transact-sql

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 table that has a clustered index and a nonclustered index. The indexes use different columns from the table. You have a query named Query1 that uses the nonclustered index.
Users report that Query1 takes a long time to report results. You run Query1 and review the following statistics for an index seek operation:

You need to resolve the performance issue.
Solution: You drop the nonclustered index.
Does the solution meet the goal?

• A.No
• B.Yes

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 clusteredcolumnstore index on the table.
• B.Create a nonclustered filtered index on the table.
• C.Create a nonclustered columnstore index on the table.
• D.Create a hash index on the table.
• E.Create a nonclustered index on the table.
• F.Create a clustered index on the table.

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.
The Leads table must include the columns described in the following table.

The data types chosen must consume the least amount of storage possible.
You need to select the appropriate data types for the Leads table.
In the table below, identify the data type that must be used for each table column.
NOTE: Make only one selection in each column.

Correct Answer:

Explanation

Bit is a Transact-SQL integer data type that can take a value of 1, 0, or NULL.
Smallint is aT ransact-SQL integer data type that can take a value in the range from -32,768 to 32,767.
int, bigint, smallint, and tinyint (Transact-SQL)
Exact-number data types that use integer data.

References: https://msdn.microsoft.com/en-us/library/ms187745.aspx
https://msdn.microsoft.com/en-us/library/ms177603.aspx