Teradata Interview Questions and Answers
Most Frequently Asked Teradata Interview Questions
In Teradata, Parsing Engine is a type of virtual processor for session control, SQL parsing and task dispatching in the multitasking and possibly Teradata Database’s parallel-processing environment.
In Teradata, Vproc or Virtual Processor is a simulated processor present in a processing software system, or in a software version of a dedicated physical processor. Each of Vproc uses a portion of the physical processor resource and runs independently of another virtual processor.
In Teradata, Fallback is a feature that offers enhanced data protection beyond that provided by redundant hardware components. Fallback is enabled when a failure occurs, Teradata can continue to perform the update, delete and insert functions because redundant copies of data exist on one or more fallback AMPs.
Teradata utilities offer developers options to quickly load data into a Teradata database or export data from a database of Teradata to a client application.
TPT or Teradata Parallel Transporter is a new generation and advance load/unload utility provided by Teradata. TPT acts as an integrated ETL suite that helps to extract data from multiple sources, load data in target Teradata database and apply transformation logic.
| S.no | Union | Union All |
|---|---|---|
| 1. | It removes duplicate records where all columns in the results are the same. | It doesn’t remove duplicate records where all columns in the results are the same. |
| 2. | The performance will be impacted with the use of Union as additional work will be performed to remove duplicate rows. | The performance will not be impacted. |