Microsoft Developing SQL Databases - 70-762 Exam Practice Test
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 the Sales Order table
How should you complete the table definition? To answer? select the appropriate Transact-SQL segments in the answer area.
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 the Sales Order table
How should you complete the table definition? To answer? select the appropriate Transact-SQL segments in the answer area.
Correct Answer:
Explanation
Box 1: NONCLUSTERED HASHWITH (BUCKET_COUNT = 10000000)
Hash index is preferable over a nonclustered index when queries test the indexed columns by use of a WHERE clause with an exact equality on all index key columns. We should use a bucket count of 10 million.
Box 2: SCHEMA_ONLY
Durability: The value of SCHEMA_AND_DATA indicates that the table is durable, meaning that changes are persisted on disk and survive restart or failover. SCHEMA_AND_DATA is the default value.
The value of SCHEMA_ONLY indicates that the table is non-durable. The table schema is persisted but any data updates are not persisted upon a restart or failover of the database. DURABILITY=SCHEMA_ONLY is only allowed with MEMORY_OPTIMIZED=ON.
References: https://msdn.microsoft.com/en-us/library/mt670614.aspx
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 enable referential integrity for the ProductReview table.
How should you complete the relevant Transact-SQL statement? To answer? select the appropriate Transact-SQL segments in the answer area.
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 enable referential integrity for the ProductReview table.
How should you complete the relevant Transact-SQL statement? To answer? select the appropriate Transact-SQL segments in the answer area.
Correct Answer:
Explanation
Box 1: WITH NOCHECK
We should use WITH NOCHECK as existing records in the ProductReview table must not be validated with the Product table.
Box 2: ON DELETE NO ACTION ON DELETE NO CASCADE
Deletes should not be allowed, so we use ON DELETE NO ACTION.
Updates should be allowed, so we use ON DELETE NO CASCADE
NO ACTION: the Database Engine raises an error, and the update action on the row in the parent table is rolled back.
CASCADE: corresponding rows are updated in the referencing table when that row is updated in the parent table.
Note: ON DELETE { NO ACTION | CASCADE | SET NULL | SET DEFAULT }
Specifies what action happens to rows in the table that is altered, if those rows have a referential relationship and the referenced row is deleted from the parent table. The default is NO ACTION.
ON UPDATE { NO ACTION | CASCADE | SET NULL | SET DEFAULT }
Specifies what action happens to rows in the table altered when those rows have a referential relationship and the referenced row is updated in the parent table. The default is NO ACTION.
Note: 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.
References: https://msdn.microsoft.com/en-us/library/ms190273.aspx
https://msdn.microsoft.com/en-us/library/ms188066.aspx
You have a Microsoft Azure SQL Database named MyDb that uses server version V12.
You plan to use Query Performance Insight to troubleshoot performance problems. The database query store is not enabled.
You need to enable the database query store to meet the following requirements for the database:
- Statistics must be aggregated every 15 minutes.
- Query stores must use no more than 1,024 megabytes (MB) of storage.
- Query information must be retained for at least 15 days.
- Queries must be captured based on resource consumption.
You connect to the database by using SQL Server Managements Studio.
How should you complete the Transact-SQL statements? To answer, drag the appropriate Transact-SQL segments to the correct locations. Each Transact-SQL segment 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.
NOTE: More than one combination of answer choices is correct. You will receive credit for any of the correct combinations you select. Each correct selection is worth one point.
You plan to use Query Performance Insight to troubleshoot performance problems. The database query store is not enabled.
You need to enable the database query store to meet the following requirements for the database:
- Statistics must be aggregated every 15 minutes.
- Query stores must use no more than 1,024 megabytes (MB) of storage.
- Query information must be retained for at least 15 days.
- Queries must be captured based on resource consumption.
You connect to the database by using SQL Server Managements Studio.
How should you complete the Transact-SQL statements? To answer, drag the appropriate Transact-SQL segments to the correct locations. Each Transact-SQL segment 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.
NOTE: More than one combination of answer choices is correct. You will receive credit for any of the correct combinations you select. Each correct selection is worth one point.
Correct Answer:
Explanation
or
Both answers are correct.
References: https://msdn.microsoft.com/en-us/library/mt604821.aspx
You are maintaining statistics for a database table named tblTransaction. The table contains more than 10 million records.
You need to create a stored procedure that meets the following requirements:
- On weekdays, update statistics for a sample of the total number of records in the table.
- On weekends, update statistics by sampling all rows in the table.
A maintenance task will call this stored procedure daily.
How should you complete the stored procedure? To answer, select the appropriate Transact-SQL segments in the answer area.
NOTE: Each correct selection is worth one point.
You need to create a stored procedure that meets the following requirements:
- On weekdays, update statistics for a sample of the total number of records in the table.
- On weekends, update statistics by sampling all rows in the table.
A maintenance task will call this stored procedure daily.
How should you complete the stored procedure? To answer, select the appropriate Transact-SQL segments in the answer area.
NOTE: Each correct selection is worth one point.
Correct Answer:
Explanation
Box 1: UPDATE STATISTICS
Box 2: SAMPLE 20 PERCENT
UPDATE STATISTICS tablenameSAMPLE number { PERCENT | ROWS }
Specifies the approximate percentage or number of rows in the table or indexed view for the query optimizer to use when it updates statistics. For PERCENT, number can be from 0 through 100 and for ROWS, number can be from0 to the total number of rows.
Box 3: UPDATE STATISTICS
Box 4: WITH FULLSCAN
FULLSCAN computes statistics by scanning all rows in the table or indexed view. FULLSCAN and SAMPLE
100 PERCENT have the same results. FULLSCAN cannot be used with the SAMPLE option.
References: https://msdn.microsoft.com/en-us/library/ms187348.aspx
You have two database tables. Table1 is a partitioned table and Table 2 is a non-partitioned table.
Users report that queries take a long time to complete. You monitor queries by using Microsoft SQL Server Profiler. You observe lock escalation for Table1 and Table 2.
You need to allow escalation of Table1 locks to the partition level and prevent all lock escalation for Table2.
Which Transact-SQL statement should you run for each table? To answer, drag the appropriate Transact-SQL statements to the correct tables. Each command 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.
Users report that queries take a long time to complete. You monitor queries by using Microsoft SQL Server Profiler. You observe lock escalation for Table1 and Table 2.
You need to allow escalation of Table1 locks to the partition level and prevent all lock escalation for Table2.
Which Transact-SQL statement should you run for each table? To answer, drag the appropriate Transact-SQL statements to the correct tables. Each command 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.
Correct Answer:
Explanation
Since SQL Server 2008 you can also control how SQL Server performs the Lock Escalation - through the ALTER TABLE statement and the property LOCK_ESCALATION. There are 3 different options available:
Box 1: Table1, Auto
The default option is TABLE, means that SQL Server *always* performs the Lock Escalation to the table level -even when the table is partitioned. If you have your table partitioned, and you want to have a Partition Level Lock Escalation (because you have tested your data access pattern, and you don't cause deadlocks with it), then you can change the option to AUTO. AUTO means that the Lock Escalation is performed to the partition level, if the table is partitioned, and otherwise to the table level.
Box 2: Table 2, DISABLE
With the option DISABLE you can completely disable the Lock Escalation for that specific table.
For partitioned tables, use the LOCK_ESCALATION option of ALTER TABLE to escalate locks to the HoBT level instead of the table or to disable lock escalation.
References:
http://www.sqlpassion.at/archive/2014/02/25/lock-escalations/
You have a database that is experiencing deadlock issues when users run queries.
You need to ensure that all deadlocks are recorded in XML format.
What should you do?
You need to ensure that all deadlocks are recorded in XML format.
What should you do?
Correct Answer: A
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You have a database named Sales.
You need to create a table named Customer that includes the columns described in the following table:
How should you complete the Transact SQL statement? To answer, select the appropriate Transact-SQL segments in the answer area.
You need to create a table named Customer that includes the columns described in the following table:
How should you complete the Transact SQL statement? To answer, select the appropriate Transact-SQL segments in the answer area.
Correct Answer:
Explanation
Box 1: MASKED WITH (FUNCTION ='default()')
The Defualt masking method provides full masking according to the data types of the designated fields.
Example column definition syntax: Phone# varchar(12) MASKED WITH (FUNCTION = 'default()') NULL Box 2: MASKED WITH (FUNCTION ='partial(3,"XXXXXX",0)') The Custom String Masking method exposes the first and last letters and adds a custom padding string in the middle. prefix,[padding],suffix examples:
PhoneNumber varchar(10) MASKED WITH (FUNCTION = 'partial(5,"XXXXXXX",0)') Box 3: MASKED WITH (FUNCTION ='email()') The Email masking method which exposes the first letter of an email address and the constant suffix ".com", in the form of an email address. [email protected].
Example definition syntax: Email varchar(100) MASKEDWITH (FUNCTION = 'email()') NULL References: https://msdn.microsoft.com/en-us/library/mt130841.aspx
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:
Does the solution meet the goal?
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:
Does the solution meet the goal?
Correct Answer: A
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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, nonrepeatable 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.
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, nonrepeatable 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.
Correct Answer:
Explanation
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-series-basics-of-transaction-isolation-levels/
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 this series.
Information and details provided in a question apply only to that question.
You have a Microsoft SQL Server database named DB1 that contains the following tables:
There are no foreign key relationships between TBL1 and TBL2.
You need to create a query that includes data from both tables and minimizes the amount of time required for the query to return data.
What should you do?
Information and details provided in a question apply only to that question.
You have a Microsoft SQL Server database named DB1 that contains the following tables:
There are no foreign key relationships between TBL1 and TBL2.
You need to create a query that includes data from both tables and minimizes the amount of time required for the query to return data.
What should you do?
Correct Answer: F
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You must troubleshoot performance issues that users report. You identify the following representative user sessions:
You need to configure the appropriate Extended Events.
Which target should you use for each session? To answer, drag the appropriate Extended Event targets to the correct sessions. Each Extended Event target may be used once, or not at all. You may need to drag the split bar between panes or scroll to view content.
You need to configure the appropriate Extended Events.
Which target should you use for each session? To answer, drag the appropriate Extended Event targets to the correct sessions. Each Extended Event target may be used once, or not at all. You may need to drag the split bar between panes or scroll to view content.
Correct Answer:
Explanation
Session 1: Event Files
Event files use to write event session output from complete memory buffers to disk. This is an asynchronous target.
Session 2: Histogram
Histogram use to count the number of times that a specified event occurs, based on a specified event column or action. This is an asynchronous target.
Note: This question is part of a series of questions that present the same scenario. Each question in the series contains a unique solution that might meet the stated goals. Some question sets might have more than one correct solution, while others might not have a correct solution.
After you answer a question in this section, you will NOT be able to return to it. As a result, these questions will not appear in the review screen.
You have a database that is 130 GB and contains 500 million rows of data.
Granular transactions and mass batch data imports change the database frequently throughout the day.
Microsoft SQL Server Reporting Services (SSRS) uses the database to generate various reports by using several filters.
You discover that some reports time out before they complete.
You need to reduce the likelihood that the reports will time out.
Solution: You increase the number of log files for the database. You store the log files across multiple disks.
Does this meet the goal?
After you answer a question in this section, you will NOT be able to return to it. As a result, these questions will not appear in the review screen.
You have a database that is 130 GB and contains 500 million rows of data.
Granular transactions and mass batch data imports change the database frequently throughout the day.
Microsoft SQL Server Reporting Services (SSRS) uses the database to generate various reports by using several filters.
You discover that some reports time out before they complete.
You need to reduce the likelihood that the reports will time out.
Solution: You increase the number of log files for the database. You store the log files across multiple disks.
Does this meet the goal?
Correct Answer: A
Vote an answer
Explanation: Only visible for Fast2test members. You can sign-up / login (it's free).
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 os independent of the other questions in this series. Information and details provided in a question apply only to that question.
You have a database named DB1. There is no memory-optimized filegroup in the database.
You run the following query:
The following image displays the execution plan the query optimizer generates for this query:
Users frequently run the same query with different values for the local variable @lastName. The table named Person is persisted on disk.
You need to create an index on the Person.Person table that meets the following requirements:
- All users must be able to benefit from the index.
- FirstName must be added to the index as an included column.
What should you do?
You have a database named DB1. There is no memory-optimized filegroup in the database.
You run the following query:
The following image displays the execution plan the query optimizer generates for this query:
Users frequently run the same query with different values for the local variable @lastName. The table named Person is persisted on disk.
You need to create an index on the Person.Person table that meets the following requirements:
- All users must be able to benefit from the index.
- FirstName must be added to the index as an included column.
What should you do?
Correct Answer: F
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Your company runs end-of-the-month accounting reports. While the reports run. other financial records are updated in the database.
Users report that the reports take longer than expected to run.
You need to reduce the amount of time it takes for the reports to run. The reports must show committed data only.
What should you do?
Users report that the reports take longer than expected to run.
You need to reduce the amount of time it takes for the reports to run. The reports must show committed data only.
What should you do?
Correct Answer: C
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