Column Store Indexes for High Performance and Data Compression
Question
You have a dedicated SQL pool in Azure Synapse Analytics.
Your objective here is to achieve high performance and data compression.
Choose the right option about the following statements.
Statement 1: Using column store indexes will increase the performance and compression.
Statement 2: The default behavior of a dedicated SQL pool is to store the table as a clustered columnstore index.
Answers
Explanations
Click on the arrows to vote for the correct answer
A. B. C. D.Correct Answer: D.
Columnstore indexes are basically used for improving query performance and data compression.
This proves that statement 1 is correct.
And by default, the SQL dedicated pool stores the table as a clustered columnstore index.
This shows that the second statement is also correct.
Also, in most cases, when performance-related concerns are introduced in question, look for columnstore indexing as an answer rather than clustered index and heap.
Clustered indexing and heap are used very rarely for specific workloads only in Azure Synapse.
Options A, B, Care incorrect: It says that at least one of the statements is wrong.
But in this case, both statements are correct.
Option D is correct: Both statements are correct.
To know more about Distribution methods, please refer to the doc below:
The correct answer is D, both statements are correct.
Explanation:
Azure Synapse Analytics is a cloud-based data analytics service that provides a dedicated SQL pool for high-performance data warehousing. In a dedicated SQL pool, data is stored in tables and can be optimized for performance and compression using columnstore indexes.
Statement 1: Using columnstore indexes will increase the performance and compression.
Columnstore indexes are designed to store and manage large amounts of data efficiently. By organizing data by columns instead of rows, columnstore indexes can improve query performance by minimizing the amount of data that needs to be read from storage. Additionally, columnstore indexes can compress data by up to 10x, reducing storage costs and improving query performance.
Therefore, statement 1 is correct.
Statement 2: The default behavior of a dedicated SQL pool is to store the table as a clustered columnstore index.
In a dedicated SQL pool, the default behavior is to store tables as clustered columnstore indexes. This means that the table data is organized by columns instead of rows and is stored in a compressed format. By default, the primary key of the table is used to create the clustered columnstore index.
Therefore, statement 2 is also correct.
In summary, using columnstore indexes can improve performance and compression, and the default behavior of a dedicated SQL pool is to store tables as clustered columnstore indexes. Therefore, both statements are correct, and the correct answer is D.
