Practice Cost-based Optimization (8.3.2) - Query Processing and Optimization
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Cost-Based Optimization

Practice - Cost-Based Optimization

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Practice Questions

Test your understanding with targeted questions

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.

4 more questions available

Interactive Quizzes

Quick quizzes to reinforce your learning

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.

1 more question available

Challenge Problems

Push your limits with advanced challenges

Challenge 1 Hard

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.

Challenge 2 Hard

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.

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Reference links

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