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Exam 70-764 topic 1 question 289 discussion

Actual exam question from Microsoft's 70-764
Question #: 289
Topic #: 1
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You have a data warehouse that stored sales data. One fact table has 100 million rows.
You must reduce storage needs for the data warehouse.
You need to implement a solution that uses column-based storage and provides real-time analytics for the operational workload.
Solution: You remove all clustered indexes, sort the transactions in the table, and create a clustered index on the table, so that the table is not a heap.
Does the solution meet the goal?

  • A. Yes
  • B. No
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Suggested Answer: A 🗳️
Columnstore indexes are the standard for storing and querying large data warehousing fact tables. It uses column-based data storage and query processing to achieve up to 10x query performance gains in your data warehouse over traditional row-oriented storage, and up to 10x data compression over the uncompressed data size.
In SQL Server, rowstore refers to table where the underlying data storage format is a heap, a clustered index, or a memory-optimized table.
References: https://docs.microsoft.com/en-us/sql/relational-databases/indexes/columnstore-indexes-overview

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Vishu1004
Highly Voted 5 years, 6 months ago
Correct answer should be B. You should use a column-store index, not a clustered index
upvoted 10 times
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Neru
Most Recent 4 years, 5 months ago
I think there was a typo in this sentence: Solution: You remove all clustered indexes, sort the transactions in the table, and create a clustered index on the table, so that the table is not a heap. It should have been create a column store index on the table.... In that case the answer would be A.
upvoted 3 times
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