CAP Theorem states that a Distributed Database System can only have 2 out of 3 properties from Availability, Consistency, and Partition Tolerance . This means that every Big Data Engineer needs to do a trade-off between these three based on the use-case and Business requirements. It is very important for any Data engineer to understand the CAP Theorem and apply it when deciding the appropriate tools for the task in the hand. Let's discuss each of the properties in detail. 1. Availability   This condition states that every request (read/write) will get a response on Success or Failure. That means every node in the system must return a response in a reasonable amount of time. This could be only possible if the system remains operational all the time. Hence, the databases are time-independent as they should be available all the time. Therefore if any two records are added to the database we don't know which one was added first and the output could be either one of them. Now le...

In my last post  How to prepare for Data Engineer Interviews ,  I wrote about how one can prepare for the Data Engineer Interviews, and in this blog post, I am going to provide the  Top 25 Basic   data engineer interview questions  asked frequently and their brief answers. This is typically the first round of the Interview where the interviewer just wants to access whether you are aware of basic concepts or not and therefore you don't need to explain it in detail. Just a single statement would be sufficient. Let's get started Checkout the 5 Key Skills Data Engineers need in 2023 A. Programming  1. What is the Static method in Python? Static methods are the methods that are bound to the  Class  rather than the Class's Object. Thus, it can be called without creating objects of the class. We can just call it using the reference of the class. Also, all the objects of the class share only one copy of the static method. 2. What is a Decorator in Python?...

In recent years, due to the humongous growth of Data, almost all IT companies want to leverage the Data for their Businesses, and that's why the Data Engineering & Data Science opportunities in IT companies are increasing at a rapid rate, we can easily say that Data Engineers are currently at the top of the list of "most hired profiles" in the year 2021-22.  And due to huge demand companies wants to hire Data Engineers who are skilled in programming, SQL, are able to design and create scalable Data Pipelines, and are able to do Data Modelling. In a way, Data engineers should possess all the skills that Software engineers have and as well as skills Data Analysts to possess. And, in interviews also the companies look for all the skills mentioned above in Data Engineers. Checkout the 5 Key skills Data Engineer need in 2023 So in this blog post, I am going to cover all the topics and domains one can expect in Data Engineer Interviews A. Programming Round Most of the Produ...