Exam 70-767 topic 1 question 7 discussion

Actual exam question from Microsoft's 70-767

Question #: 7
Topic #: 1

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 the following line-of-business solutions:
✑ ERP system
✑ Online WebStore
✑ Partner extranet
One or more Microsoft SQL Server instances support each solution. Each solution has its own product catalog. You have an additional server that hosts SQL
Server Integration Services (SSIS) and a data warehouse. You populate the data warehouse with data from each of the line-of-business solutions. The data warehouse does not store primary key values from the individual source tables.
The database for each solution has a table named Products that stored product information. The Products table in each database uses a separate and unique key for product records. Each table shares a column named ReferenceNr between the databases. This column is used to create queries that involve more than once solution.
You need to load data from the individual solutions into the data warehouse nightly. The following requirements must be met:
✑ If a change is made to the ReferenceNr column in any of the sources, set the value of IsDisabled to True and create a new row in the Products table.
✑ If a row is deleted in any of the sources, set the value of IsDisabled to True in the data warehouse.
Solution: Perform the following actions:
✑ Enable the Change Tracking for the Product table in the source databases.
✑ Query the CHANGETABLE function from the sources for the updated rows.
✑ Set the IsDisabled column to True for the listed rows that have the old ReferenceNr value.
✑ Create a new row in the data warehouse Products table with the new ReferenceNr value.
Does the solution meet the goal?

A. Yes
B. No

Show Suggested Answer

Suggested Answer: B 🗳️
We must check for deleted rows, not just updates rows.
References: https://www.timmitchell.net/post/2016/01/18/getting-started-with-change-tracking-in-sql-server/

by Anette at Aug. 13, 2020, 12:59 p.m.

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DudeHere

4 years, 7 months ago

I'm going with YES. "SQL Server 2008 introduces two tracking features that enable applications to determine the DML changes (insert, update, and delete operations) that were made to user tables in a database. Before these features were available, custom tracking mechanisms had to be implemented in applications. Change tracking captures the fact that rows in a table were changed, but does not capture the data that was changed. This enables applications to determine the rows that have changed with the latest row data being obtained directly from the user tables." https://docs.microsoft.com/en-us/previous-versions/sql/sql-server-2008-r2/cc280519(v=sql.105)?redirectedfrom=MSDN

upvoted 2 times

nickname_200

4 years, 5 months ago

Aww so the answer is YES

upvoted 1 times

eggzamtaker

4 years, 5 months ago

Wrong. The answer is NO. CDC is what you want not simply Change Tracking.

upvoted 1 times

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Cococo

4 years, 9 months ago

"Enable the Change Tracking" - This only lets you know that a particular row has changed since your last query. You have no idea - how many times it’s changed, the various change values over time. So, you need a solution with CDC. https://www.sqlservercentral.com/blogs/the-difference-between-change-tracking-and-change-data-capture

upvoted 2 times

Cococo

4 years, 9 months ago

Question 9 has the cdc.fn_cdc_get_all_changes_capture_dbo_products function but it is not doing this - "Set the IsDIsabled column to True on the data warehouse Products table for the listed rows."

upvoted 1 times

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