October 26

1 comments

A Short Teradata Quiz for You

By Roland Wenzlofsky

October 26, 2015


Here is a short Teradata Quiz for you. I hope you like it.

 

 

Welcome to the Teradata Quiz.

Each time you take the quiz, a different set of questions will be asked. We are adding new questions on a regular base. At the end of the quiz, we will show you the correct answers, your score and the average score of all people.

Enter your name and press "NEXT" to start the quiz

Name Email
1. Which of the following are conditions for changing Partition definitions using an ALTER TABLE statement?
2. Which of the following statements is true regarding temporary space?
3. What are advantages when using MERGE instead of UPDATE?
4. Do NOPI tables have a ROWID?
5. After an UPDATE statement is running for more than 1 hour you cancel it. As a result a rollback begins. Can it be stopped?
6. You execute the following request: SELECT * FROM TheTable WHERE TheColumn is NULL. Will Teradata check the row value,the presence bit or the table header?
7. The column DelayTime in the DBC.DBQLOGTBL shows what?
8. Which of the following are types of columns that is supported with compression?
9. Which protocols Teradata implements to cover utility workload?
10. When you compress multiple values for a column, where is it stored?

Be sure to click "Submit Quiz" to see your results
(click only once, the rating process may need a couple of seconds)!



Roland Wenzlofsky


Roland Wenzlofsky is a graduated computer scientist and Data Warehouse professional working with the Teradata database system for more than 20 years. He is experienced in the fields of banking and telecommunication with a strong focus on performance optimization.

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  • 1)Which of the following is not stored in a sub table?
    Answer Provided: Join Index (JI).Row Partitioned Table.
    Correct Answer: Row Partitioned Table.

    comment: I am aware only the Secondary indexes in Teradata creates sub-table, but for the above question, why the JI stored in sub table, does this question meant that JI allows creation of SI over the JI or does it meant Join Index (JI) stores its join results in perm space.

    2) Which of these technical join types are available on Teradata?
    Answer Provided: Left Outer Join.
    Correct Answer: Hash Join.Merge Join.Sliding Window Merge Join.Product Join.

    Comment: Hash Join, Merge Join, Sliding Window Merge Join and Product Join are the join strategies determined by the optimizer based on the joining tables data distribution, so I have answered Left outer join is the Join Type, a user can decide based on his business need.

    3) Are tables without Primary Index (NOPI) always distributed evenly across all AMPs?
    Answer Provided: Yes
    Correct Answer: No

    Comment: Could you explain to me why the NOPI tables not always evenly distributed across all AMPs.

    Kindly advise me on how to approach the above questions.

    Thanks,

    Reply

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