Databricks Certified Data Engineer - Associate
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In a scenario where you are working with a large Delta Lake table that is frequently queried for analytics, you notice that query performance is not meeting the expected benchmarks. After analyzing the situation, you consider implementing Z-Ordering to optimize the data layout. Given the constraints of minimizing storage costs while maximizing query performance, and the requirement to comply with data governance policies, which of the following best describes the role of Z-Ordering and its impact on the query execution process? Choose the best option from the four provided.
In a scenario where you are working with a large Delta Lake table that is frequently queried for analytics, you notice that query performance is not meeting the expected benchmarks. After analyzing the situation, you consider implementing Z-Ordering to optimize the data layout. Given the constraints of minimizing storage costs while maximizing query performance, and the requirement to comply with data governance policies, which of the following best describes the role of Z-Ordering and its impact on the query execution process? Choose the best option from the four provided.
Explanation:
The correct answer is A. Z-Ordering is a method of sorting data that groups together rows with similar values, resulting in a more compact and efficient representation of the data. This can significantly improve query performance by reducing the number of files that need to be scanned, as the query can quickly locate and access the relevant data without having to scan the entire dataset. Z-Ordering helps in improving the performance of queries by minimizing the amount of data that needs to be read and processed, and it does so without increasing storage costs, making it an ideal solution under the given constraints.