Describe the importance of indexes in database performance tuning
Describe the importance of indexes in database performance tuning
1. What is a view and how is a view created?
Do the data described in the view definition ever exist in that view?
What happens when a user accesses data through a view?
2. What is an index?
What are the advantages and disadvantages of using indexes?
How do you use SQL to create an index?
3. What is the system catalog? Name three things about which information is stored in the system catalog.
4. What are nulls? Which field cannot accept null values and why?
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