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Briefly how to make use of indexes such as b+ tree

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Reference no: EM13336565

Concepts and principles

(Each answer should contain approximately 300 words.)

Question 1

Summarize briefly how to make use of indexes such as B+ tree or a hash indexes in selection, projection, and join operations?

Question 2

Explain why two different hash functions are used in hash join, and how to select them.

Question 3

Define the concept of reduction factor, and explain how it is calculated based on what statistics are available in the catalogs.

Question 4

Explain what a typical optimizer does, and what strategies can be used to generate a good plan, and how it can affect the performance of a DBMS.

Question 5

Define relational algebra equivalences, and explain how they can be used for plan generation. You may use pushing selection (ahead of joins) and re-ordering join expressions as examples.

 

Reference no: EM13336565

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