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Query Optimizer

1. What is query optimizer and what does?

2. What are the types of query optimizer?

3. What operation query optimizer performs?

4. What do you mean by “Throughput” or “Best response Time”?

5. How optimizer mode can be change?

6. What is optimizer mode SQL Hint and what does?

7. What are optimizer statistics how can be collected?

8. What do you mean by Histograms?

9. What is an access path for query optimizer?

10. What are the different types of access path that can be followed by optimizer?

11. What are joins? How query optimizer executes join statements and chooses execution plan for join statement?

12. What is Nested Loop Joins?

13. What is Hash Joins?

14. What is Sort Merge Joins?

15. What is Cartesian Joins?

16. What is Outer Joins?

17. What is Full Outer Joins?

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