Ameren Etl Developer Interview Questions

What is your experience in the field?

In spite of the current popularity of the term “big data” and every industry’s sudden interest in business intelligence, the data warehousing field has been around for a long time. The concept of data warehousing goes back to the 1980s, with some components dating back to the 1960s. While there are benefits to both brand-new applicants and old pros, it’s good to know what you’re working with.

How Do You Handle High-Pressure Situations?

Tight deadlines are something every ETL developer is going to have to deal with at some point. Understanding how the candidate operates under pressure is a good indicator of whether this is someone you want on your team when things get tight. It can be the difference between getting the job done and having it fail.

3 How are the tables analyzed in ETL?

Statistics generated by the ANALYZE statement is reused by a cost-based optimizer in order to calculate the most efficient plan for data retrieval. The ANALYZE statement can support the validation of structures of objects, as well as space management, in the system. Operations include COMPUTER, ESTIMATE, and DELETE.

What is meant by partitioning in ETL?

Partitioning in ETL refers to the sub-division of the transactions in order to improve their performance.

Why is data warehousing important?

Sample answer:

Data warehousing is a core component of business intelligence. By bringing different data sources under a single, unified library, analysts can work more efficiently, get more in-depth insights, and spot patterns across different datasets.

Ultimately, it helps businesses be more competitive by improving their decision-making process.

What are some of the most common types of ETL testing?

Sample answer:

There are several ETL testing methods, each one serving a specific purpose at different points in the ETL process. Some of the most common types of ETL testing are:

  • Production validation: Data in the target system is compared against the sources for validity purposes
  • Source to target count testing: The number of loaded records in the data warehouse is checked for consistency against the expected record count
  • Performance testing: The loading process is tested to make sure it takes place within the expected time frames
  • Data transformation testing: Data in the target system is checked to verify that it has been correctly transformed in line with business requirements
  • 2 What is Workflow in ETL?

    Workflow is a set of instructions that specify the way of executing the tasks to the Informatica.

    Also, prepare yourself for the Informatica Interview Questions and Answers!

    2 What is the use of Mapplet in ETL?

    Mapplet in ETL is used for the purpose of creation as well as the configuration of a group of transformations.

    Define (X, Y, Z) terms

    This may seem like a no-brainer, but ask the applicant what ETL stands for, and what they think it means. Then ask about some standard ETL terminology – CRUD or OLAP. What is a data warehouse, and how is it different from a database? What is a virtual data warehouse? It’s not only the answers to these – and all questions, really – that are important, but how easily they answer them, demonstrating their depth of knowledge.

    1 What is data profiling in ETL?

    Sample answer:

    Data profiling is the process of reviewing source data to identify its structure, quality, and interrelationships.

    It’s an important precursor to the analysis stage, as it ensures that the appropriate source data is loaded into the data warehouse and that it is transformed in line with the business requirements.

    ETL Developer Interview Questions

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