Practice Query Execution Plan Analysis (19.2.2) - Advanced SQL and NoSQL for Data Science

Practice: Query Execution Plan Analysis

Lesson 19.2.2Advanced SQL and NoSQL for Data Science

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9 questions

Flashcard drill
5 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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Quiz
3 questions · about 2 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What does the EXPLAIN command do?
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Think of it as a planning phase for the database.
Question 2.
Define a Table Scan.
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Think about searching for a needle in a haystack.
3Question 3.
What information does the EXPLAIN command provide?
- The amount of memory used
- The execution plan of a query
- The duration taken to execute a query
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It's about the plan, not the execution.
4Question 4.
True or False: EXPLAIN ANALYZE executes the query and provides runtime statistics.
- True
- False
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It's more hands-on than just looking at the plan.
Question 5.
Given a slow-running SQL query, analyze the provided execution plan and identify at least three potential bottlenecks.
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Consider where inefficiencies might occur based on the plan's structure.
Question 6.
Design an optimized version of a SQL query that previously resulted in a table scan, incorporating indexing where necessary.
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Focus on how to reduce the data load from the beginning.

5 more questions in this section. Enroll free to practise them all.