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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is cost-based optimization?
💡 Hint: Think about how a database chooses the best way to run a query.
Question 2
Easy
What factors does cost-based optimization consider?
💡 Hint: Consider what resources are used when executing a query.
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 is the main goal of cost-based optimization?
- To generate random execution plans
- To find the lowest estimated cost execution plan
- To always perform full table scans
💡 Hint: Think about what the optimizer seeks to minimize.
Question 2
True or False: Cost-based optimization uses fixed rules for execution plan selection.
- True
- False
💡 Hint: Consider how different methods make decisions.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Given a SQL query, analyze how changes in the database schema might affect the cost estimates of execution plans. Consider factors like added indexes or table size.
💡 Hint: Reflect on how actual data distribution differs from initial statistics.
Question 2
Design a simple cost estimation model that could be used within a DBMS. Identify parameters and how they will influence the decision-making process in selecting a planning strategy.
💡 Hint: Consider how estimations can be derived from past query performances.
Challenge and get performance evaluation