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Teradata Interview Questions and Answers

Test your skills through the online practice test: Teradata Quiz Online Practice Test

Ques 6. What is the purpose of the BYNET in Teradata?

The BYNET (Binary Network) is a communication layer in Teradata that facilitates communication between AMPs and ensures the parallel processing of queries across multiple nodes in a Teradata system.

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Ques 7. Explain the concept of MultiLoad in Teradata.

MultiLoad is a utility in Teradata used for efficiently loading, updating, or deleting large volumes of data from tables. It works by using multiple sessions to load or update data in parallel.

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Ques 8. What are fallback and non-fallback options in Teradata?

Fallback and non-fallback are options for Teradata tables. Fallback means that a duplicate copy of each row is stored on a different AMP for fault tolerance, while non-fallback means there is no duplicate copy.

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Ques 9. How does Teradata handle concurrency control?

Teradata uses a combination of locks and timestamps for concurrency control. It employs row-level locks and a two-phase locking protocol to manage concurrent access to data.

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Ques 10. Explain the use of the PARTITION BY clause in Teradata.

The PARTITION BY clause in Teradata is used in window functions to divide the result set into partitions to which the window function is applied separately. It is commonly used with functions like ROW_NUMBER() and RANK().

Example:

SELECT emp_id, emp_name, salary, ROW_NUMBER() OVER (PARTITION BY department_id ORDER BY salary DESC) as row_num FROM employees;

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