Teradata Database is a widely used Relational Database Management System(RDBMS). Teradata, one of the world’s leading enterprise software companies, developed this system. It’s an open system that runs on a UNIX MP-RAS/Windows server platform. It’s capable of supporting several concurrent users from multiple client platforms, which is quite remarkable. Teradata is based on a parallel architecture.
Given below are some features of Teradata:
About Teradata online test
Teradata Developers are software engineering professionals who manage database functions. Some of their responsibilities include collecting information, granting permission on database objects, performing statistical analysis, database migration, managing partitions, and looking after user accounts, etc. Moreover, given the nature of their job, Teradata developers are expected to be technically competent, analytical, team player, problem solver, detail-oriented, and effective communicators. The ideal candidate is one who possesses all these character traits. That’s where the Teradata test comes in handy. Hiring managers and recruiters can start testing candidates using such pre-employment assessments.
Teradata online tests are useful for evaluating the below-mentioned relevant skills:
Are you looking for a customised version of this test. Or looking to get a new test build according to your requirements from scratch? Reach out to our subject matter experts and discuss the same.
Why should you use Mercer | Mettl’s Teradata test?
The Teradata online test comprises well-laid-out MCQ questions used to gauge the candidates’ skills and abilities in Teradata. Tech recruiters can use the Teradata test for pre-screening candidates. Doing so will ensure that only those candidates that fit the job criteria are taken to the next level of the interview process.
The Teradata online test is intended for thoroughly assessing the knowledge and analysis skills of the candidates. Rather than relying solely on theoretical knowledge of candidates, employers can use this test to ascertain whether the candidates have sufficient professional knowledge.
Mettl’s Teradata Skills Test is designed in such a way that it provides tech recruiters with a better understanding of the candidates’ abilities. This test consists of 30 multiple choice questions to be answered in 45 minutes.
Key profiles the test is useful for:
|Number of Questions||30|
|Test Duration||45 Minutes|
|Number of MCQ questions based on RDBMS - ER Data model||1|
|Number of MCQ questions based on RDBMS - Normal forms||2|
|Number of MCQ questions based on RDBMS - ACID Properties and Transactions||1|
|Number of MCQ questions based on ANSI SQL - Functions - String and Aggregate||2|
|Number of MCQ questions based on ANSI SQL - Queries and Subqueries||2|
|Number of MCQ questions based on ANSI SQL - View and Index||2|
|Number of MCQ questions based on Teradata Developer - Schema||2|
|Number of MCQ questions based on Teradata Developer - String Manipulation||2|
|Number of MCQ questions based on Teradata Developer - Built-in Functions||2|
|Number of MCQ questions based on Teradata Developer - Table Types||2|
|Number of MCQ questions based on Teradata Developer - Compression||2|
|Number of MCQ questions based on Teradata Developer - Hashing Algorithm||2|
|Number of MCQ questions based on Teradata Developer - Join Index||2|
|Number of MCQ questions based on Teradata Developer - Stored Procedure||2|
|Number of MCQ questions based on Teradata Developer - OLAP Functions||2|
|Number of MCQ questions based on Teradata Developer - Query Optimization||2|
Candidates with a work experience of 3-6 years are eligible to take the test
Difficulty level: Moderate
Q. Can candidates be benchmarked based on the internal sample set?
A. Yes, at Mettl, it can be done. Should you need any further information, please write to us, and we will be happy to assist you.
Q. Is it possible to customize the report as per the need?
A. Yes, we can do it. We have already done it in the past for our clients. Should you need any further information, please write to us, and we will be happy to find the best solution for you.
Q. What are the most common questions asked in a Teradata interview?
A. Those candidates who are looking for a job in this field can prepare in advance for the interviews. Here, we have presented a list of the most commonly asked questions that will help students get an idea about the kind of questions that are being asked.
1) Basic Teradata interview questions
a)What is Teradata, and what are its features?
Teradata is RDBMS that is useful for developing wide-scale data warehousing applications. It utilizes the concept of parallelism. It is an open system and comes with a lot of intriguing features: Teradata viewpoint, automated temporal analytics, data compression, and performance compression.
b)What are the different types of tables that are supported by Teradata?
Given below are different table types that are supported by Teradata:
c)What are the main components of the Teradata system?
Listed below are the major components of the Teradata system:
Access Module Processor (AMP): It finds its applications in processes such as storing the actual data and retrieving the agent in the database system. AMP makes it easy to physically read and write the data to disks or storage location
Message Passing layer (MPL): It acts as a networking layer in the Teradata Database System. It is crucial for establishing communication between the AMP, parsing engine, and nodes.
Nodes: A node could act as an individual server and a basic unit for the Teradata system. It primarily consists of its own copy of the OS, memory, CPU, disk space, and RDBMS.
Parsing engine: this engine is meant for receiving the client-server request and creating the implementation plan accordingly.
d)Mention a few of the ETL tools that come under Teradata?
The common ETL tools that are used are Informatica, data stage, and SSIS.
e)What is the primary index in Teradata?
This mechanism identifies where the data is located in a Teradata system. Each table in Teradata should have the primary index specified. There are two types of primary indexes: unique index and non-unique primary index.
2) Advanced Teradata Interview Questions
a)What’s the difference between the primary key and the primary index?
A primary key is optional in Teradata, whereas a primary index is crucial for the table. There are no limitations for tables and columns in the primary key, whereas the primary index limits itself to 64 tables or columns. Unlike the primary index, the primary key permits null or duplicate values in tables.
b)What are the benefits of the partitioned primary index(PPI)?
PPI is an indexing mechanism that’s used in improving query performance. Some of the advantages of PPI are enlisted as follows:
It makes adding the new data and deleting the old one an easy task
It enables us to access the large table in significantly less time
c)What is an UPSERT command?
UPSERT command is used to update the rows that are present and insert rows that don’t exist. In Teradata, this is achievable through MERGE or UPDATE-ELSE-INSERT.
d)Explain skewness and the purpose of NULLIF Expression in Teradata?
Skewness describes the uneven distribution of data on access module processors and represents skewness in terms of percentage. NULLIF function enables the comparison of the two arguments. If the two arguments match, it returns null, or else it returns the first argument.
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