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QUESTION 288
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 data warehouse that stores information about products, sales, and orders for a manufacturing company. The instance contains a database that has two tables named SalesOrderHeader and SalesOrderDetail. SalesOrderHeader has 500,000 rows and SalesOrderDetail has 3,000,000 rows.
Users report performance degradation when they run the following stored procedure:
You need to optimize performance.
Solution: You run the following Transact-SQL statement:
Does the solution meet the goal?
A. Yes
B. No
Answer: A
Explanation:
UPDATE STATISTICS updates query optimization statistics on a table or indexed view. FULLSCAN computes statistics by scanning all rows in the table or indexed view. FULLSCAN and SAMPLE 100 PERCENT have the same results.
https://docs.microsoft.com/en-us/sql/t-sql/statements/update-statistics-transact-sql?view=sql-server-2017
QUESTION 289
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 plan to deploy a Microsoft SQL server that will host a data warehouse named DB1.
The server will contain four SATA drives configured as a RAID 10 array.
You need to minimize write contention on the transaction log when data is being loaded to the database.
Solution: You replace the SATA disks with SSD disks.
Does this meet the goal?
A. Yes
B. No
Answer: B
Explanation:
A data warehouse is too big to store on an SSD.
Instead you should place the log file on a separate drive.
References:
https://docs.microsoft.com/en-us/sql/relational-databases/policy-based-management/place-data-and-log-files-on-separate-drives?view=sql-server-2017
QUESTION 290
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 plan to deploy a Microsoft SQL server that will host a data warehouse named DB1.
The server will contain four SATA drives configured as a RAID 10 array.
You need to minimize write contention on the transaction log when data is being loaded to the database.
Solution: You add more data files to DB1.
Does this meet the goal?
A. Yes
B. No
Answer: B
Explanation:
There is no performance gain, in terms of log throughput, from multiple log files. SQL Server does not write log records in parallel to multiple log files.
Instead you should place the log file on a separate drive.
References:
https://www.red-gate.com/simple-talk/sql/database-administration/optimizing-transaction-log-throughput/
https://docs.microsoft.com/en-us/sql/relational-databases/policy-based-management/place-data-and-log-files-on-separate-drives?view=sql-server-2017
QUESTION 291
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 plan to deploy a Microsoft SQL server that will host a data warehouse named DB1.
The server will contain four SATA drives configured as a RAID 10 array.
You need to minimize write contention on the transaction log when data is being loaded to the database.
Solution: You configure the server to automatically delete the transaction logs nightly.
Does this meet the goal?
A. Yes
B. No
Answer: B
Explanation:
You should place the log file on a separate drive.
References:
https://www.red-gate.com/simple-talk/sql/database-administration/optimizing-transaction-log-throughput/
https://docs.microsoft.com/en-us/sql/relational-databases/policy-based-management/place-data-and-log-files-on-separate-drives?view=sql-server-2017
QUESTION 292
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 Microsoft Azure SQL Data Warehouse instance. You run the following Transact-SQL statement:
The query fails to return results.
You need to determine why the query fails.
Solution: You run the following Transact-SQL statements:
Does the solution meet the goal?
A. Yes
B. No
Answer: A
Explanation:
To use submit_time we must use sys.dm_pdw_exec_requests table, which holds information about all requests currently or recently active in SQL Data Warehouse. It lists one row per request/query.
Label is an Optional label string associated with some SELECT query statements.
https://docs.microsoft.com/en-us/sql/relational-databases/system-dynamic-management-views/sys-dm-pdw-exec-requests-transact-sql?view=aps-pdw-2016-au7
QUESTION 293
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 Microsoft Azure SQL Data Warehouse instance. You run the following Transact-SQL statement:
The query fails to return results.
You need to determine why the query fails.
Solution: You run the following Transact-SQL statement:
Does the solution meet the goal?
A. Yes
B. No
Answer: B
Explanation:
To use submit_time we must use sys.dm_pdw_exec_requests table.
https://docs.microsoft.com/en-us/sql/relational-databases/system-dynamic-management-views/sys-dm-pdw-exec-requests-transact-sql?view=aps-pdw-2016-au7
QUESTION 294
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 Microsoft Azure SQL Data Warehouse instance. You run the following Transact-SQL statement:
The query fails to return results.
You need to determine why the query fails.
Solution: You run the following Transact-SQL statements:
Does the solution meet the goal?
A. Yes
B. No
Answer: B
Explanation:
We must use Label, not QueryID in the WHERE clause.
https://docs.microsoft.com/en-us/sql/relational-databases/system-dynamic-management-views/sys-dm-pdw-exec-requests-transact-sql?view=aps-pdw-2016-au7
QUESTION 295
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.
Your company uses Microsoft SQL Server to deploy a data warehouse to an environment that has a SQL Server Analysis Services (SSAS) instance. The data warehouse includes the Fact.Order table as shown in the following table definition. The table has no indexes.
You must minimize the amount of space that indexes for the Fact.Order table consume. You run the following queries frequently. Both queries must be able to use a columnstore index:
You need to ensure that the queries complete as quickly as possible.
Solution: You create a measure for the Fact.Order table.
Does the solution meet the goal?
A. Yes
B. No
Answer: B
Explanation:
You should use a columnstore index.
Columnstore indexes are the standard for storing and querying large data warehousing fact tables. This index uses column-based data storage and query processing to achieve gains up to 10 times the query performance in your data warehouse over traditional row-oriented storage.
https://docs.microsoft.com/en-us/sql/relational-databases/indexes/columnstore-indexes-overview?view=sql-server-2017
QUESTION 296
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.
Your company uses Microsoft SQL Server to deploy a data warehouse to an environment that has a SQL Server Analysis Services (SSAS) instance. The data warehouse includes the Fact.Order table as shown in the following table definition. The table has no indexes.
You must minimize the amount of space that indexes for the Fact.Order table consume. You run the following queries frequently. Both queries must be able to use a columnstore index:
You need to ensur
e that the queries complete as quickly as possible.
Solution: You create two nonclustered indexes. The first includes the [Order Date Key] and [Tax Amount] columns. The second will include the [Order Date Key] and [Total Excluding Tax] columns.
Does the solution meet the goal?
A. Yes
B. No
Answer: B
Explanation:
You should use a columnstore index.
Columnstore indexes are the standard for storing and querying large data warehousing fact tables. This index uses column-based data storage and query processing to achieve gains up to 10 times the query performance in your data warehouse over traditional row-oriented storage.
https://docs.microsoft.com/en-us/sql/relational-databases/indexes/columnstore-indexes-overview?view=sql-server-2017
QUESTION 297
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.
Your company uses Microsoft SQL Server to deploy a data warehouse to an environment that has a SQL Server Analysis Services (SSAS) instance. The data warehouse includes the Fact.Order table as shown in the following table definition. The table has no indexes.
You must minimize the amount of space that indexes for the Fact.Order table consume. You run the following queries frequently. Both queries must be able to use a columnstore index:
You need to ensure that the queries complete as quickly as possible.
Solution: You create one columnstore index that includes the [Order Date Key], [Tax Amount], and [Total Excluding Tax] columns.
Does the solution meet the goal?
A. Yes
B. No
Answer: A
Explanation:
You should use a columnstore index.
Columnstore indexes are the standard for storing and querying large data warehousing fact tables. This index uses column-based data storage and query processing to achieve gains up to 10 times the query performance in your data warehouse over traditional row-oriented storage.
https://docs.microsoft.com/en-us/sql/relational-databases/indexes/columnstore-indexes-overview?view=sql-server-2017
QUESTION 298
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 Microsoft SQL server that has Data Quality Services (DQS) installed.
You need to review the completeness and the uniqueness of the data stored in the matching policy.
Solution: You profile the data.
Does this meet the goal?
A. Yes
B. No
Answer: B
Explanation:
Use a matching rule.
https://docs.microsoft.com/en-us/sql/data-quality-services/create-a-matching-policy?view=sql-server-2017
QUESTION 299
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 Microsoft SQL server that has Data Quality Services (DQS) installed.
You need to review the completeness and the uniqueness of the data stored in the matching policy.
Solution: You create a matching rule.
Does this meet the goal?
A. Yes
B. No
Answer: B
Explanation:
Use a matching rule, and use completeness and uniqueness data to determine what weight to give a field in the matching process.
If there is a high level of uniqueness in a field, using the field in a matching policy can decrease the matching results, so you may want to set the weight for that field to a relatively small value. If you have a low level of uniqueness for a column, but low completeness, you may not want to include a domain for that column.
https://docs.microsoft.com/en-us/sql/data-quality-services/create-a-matching-policy?view=sql-server-2017
QUESTION 300
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 Microsoft SQL server that has Data Quality Services (DQS) installed.
You need to review the completeness and the uniqueness of the data stored in the matching policy.
Solution: You modify the weight of the domain in the matching rule.
Does this meet the goal?
A. Yes
B. No
Answer: A
Explanation:
Use a matching rule, and use completeness and uniqueness data to determine what weight to give a field in the matching process.
If there is a high level of uniqueness in a field, using the field in a matching policy can decrease the matching results, so you may want to set the weight for that field to a relatively small value. If you have a low level of uniqueness for a column, but low completeness, you may not want to include a domain for that column.
https://docs.microsoft.com/en-us/sql/data-quality-services/create-a-matching-policy?view=sql-server-2017
QUESTION 301
You have a server that has Data Quality Services (DQS) installed.
You create a matching policy that contains one matching rule.
You need to configure the Similarity of Similar percentage that defines a match.
Which similarity percentage will always generate a similarity score of 0?
A. 55
B. 80
C. 70
D. 75
Answer: A
Explanation:
The minimum similarity between the values of a field is 60%. If the calculated matching score for a field of two records is less than 60, the similarity score is automatically set to 0.
https://docs.microsoft.com/en-us/sql/data-quality-services/create-a-matching-policy?view=sql-server-2017
QUESTION 302
You need to ensure that a downstream system can consume data in a Master Data Services (MDS) system.
What should you configure?
A. a Data Collector
B. a knowledge base
C. a matching policy
D. a subscription view
Answer: D
Explanation:
Subscription views to consume your master data.
https://docs.microsoft.com/en-us/sql/master-data-services/master-data-services-overview-mds?view=sql-server-2017
QUESTION 303
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 database named DB1 that has change data capture enabled.
A Microsoft SQL Server Integration Services (SSIS) job runs once weekly. The job loads changes from DB1 to a data warehouse by querying the change data capture tables.
You remove the Integration Services job.
You need to stop tracking changes to the database. The solution must remove all the change data capture configurations from DB1.
Which stored procedure should you execute?
A. catalog.deploy_project
B. catalog.restore_project
C. catalog.stop_operation
D. sys.sp_cdc_add_job
E. sys.sp_cdc_change_job
F. sys.sp_cdc_disable_db
G. sys.sp_cdc_enable_db
H. sys.sp_cdc_stop_job
Answer: F
Explanation:
sys.sp_cdc_disable_db disables change data capture for all tables in the database currently enabled. All system objects related to change data capture, such as change tables, jobs, stored procedures and functions, are dropped.
https://docs.microsoft.com/en-us/sql/relational-databases/system-stored-procedures/sys-sp-cdc-disable-db-transact-sql?view=sql-server-2017
QUESTION 304
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 database named DB1 that has change data capture enabled.
A Microsoft SQL Server Integration Services (SSIS) job runs once weekly. The job loads changes from DB1 to a data warehouse by querying the change data capture tables.
Users report that an application that uses DB1 is suddenly unresponsive.
You discover that the Integration Services job causes severe blocking issues in the application.
You need to ensure that the users can run the application as quickly as possible.
Your SQL Server login is a member of only the ssis_admin database role.
Which stored procedure should you execute?
A. catalog.deploy_project
B. catalog.restore_project
C. catalog.stop_operation
D. sys.sp_cdc_add_job
E. sys.sp_cdc_change_job
F. sys.sp_cdc_disable_db
G. sys.sp_cdc_enable_db
H. sys.sp_cdc_stop_job
Answer: E
Explanation:
sys.sp_cdc_change_job modifies the configuration of a change data capture cleanup or capture job in the current database.
https://docs.microsoft.com/en-us/sql/relational-databases/system-stored-procedures/sys-sp-cdc-change-job-transact-sql?view=sql-server-2017
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