Teradata Interview Questions

  1. What are aggregate tables? How do you design them using Teradata?
  2. Explain Teradata utilities. What is MultiLoad , Fast Load, Tpump ?
  3. When do you use each of these? Why? Explain in detail.
  4. Explain Teradata Architecture in detail with a diagram.
  5. What are default access rights in teradata? What explicit right can be given to a User?
  6. What happens in a conflict? How do you handle that?
  7. Explain the Teradata Primary Index Mechanics in detail with a diagram.
  8. In general, how do you optimze any SQL in Teradata?
  9. What are the various indexes in Teradata? How to use them? Why are they preferred?
  10. Some Data Warehousing concept questions like – What are dimentions, facts?
  11. Explain and compare pros and cons of Snow Flake Schemas, and Start Schemas.
  12. What is Spool Space? Why do you get spool space errors? How do trouble-shoot them?
  13. Explain Stored Procedure in detail.. its structure…exact syntax .. in and out?
  14. Why are they to be used? Compare it with a Macro.
Teradata Interview Questions

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An aggregate table is those tables which contain the summary of the existing warehouse. It is used to save the time as retrieving data from a million of records in the actual table will take too much time. So, aggregate the tables to a certain level of dimensions and use them.

Teradata supports some aggregate functions which are:

  • COUNT: It is used to count the rows.
  • SUM: used to calculate the sum of specified columns.
  • MIN: To find the minimum value from specified columns.
  • MAX: to find the maximum value from specified columns
  • AVG: to calculate the average of specified columns.