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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What does the EXPLAIN command do?
💡 Hint: Think of it as a planning phase for the database.
Question 2
Easy
Define a Table Scan.
💡 Hint: Think about searching for a needle in a haystack.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
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
💡 Hint: It's about the plan, not the execution.
Question 2
True or False: EXPLAIN ANALYZE executes the query and provides runtime statistics.
- True
- False
💡 Hint: It's more hands-on than just looking at the plan.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Given a slow-running SQL query, analyze the provided execution plan and identify at least three potential bottlenecks.
💡 Hint: Consider where inefficiencies might occur based on the plan's structure.
Question 2
Design an optimized version of a SQL query that previously resulted in a table scan, incorporating indexing where necessary.
💡 Hint: Focus on how to reduce the data load from the beginning.
Challenge and get performance evaluation