Wipro Database Engineer Interview Questions, Process, and Tips

Q1. What is CAP theorem What is column families What function are used in cassandra what is key value pair
Ans. 
CAP theorem states that in a distributed system, it is impossible to simultaneously guarantee consistency, availability, and partition tolerance.
• CAP theorem: Consistency, Availability, Partition tolerance - pick two

• Column families: A way to organize data in NoSQL databases like Apache Cassandra

• Functions in Cassandra: read, write, delete, update

• Key value pair: Basic data structure where each key is associated with a val
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Q2. What is Cloumn families
Ans. 
Column families are a way to organize related data in a NoSQL database, grouping columns together for efficient retrieval.
• Column families are a way to group related columns together in a NoSQL database.

• They are used in databases like Apache Cassandra to organize data efficiently.

• Column families can contain a large number of columns, each with a unique name and value.

• They are stored together on disk for faster retrieval...read more
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Q3. What are the functions in cassandra
Ans. 
Cassandra functions are used for data manipulation and retrieval in Cassandra database.
• Aggregate functions like COUNT, SUM, AVG, MIN, MAX

• Date and time functions like NOW, DATEOF, UNIXTIMESTAMP

• Mathematical functions like ABS, CEIL, FLOOR, SIN, COS

• String functions like LENGTH, SUBSTRING, CONCAT, LOWER, UPPER
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Q4. Fundamentels of cassandra
Ans. 
Cassandra is a distributed NoSQL database management system designed for handling large amounts of data across multiple servers.
• Cassandra is a highly scalable and fault-tolerant database system.

• It is based on a distributed architecture, with data spread across multiple nodes.

• Cassandra uses a masterless design, where all nodes are equal and can handle read and write requests.

• It uses a partitioning strategy called consis...read more
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Q5. What is key value pair
Ans. 
Key value pair is a data structure where each key is associated with a corresponding value.
• Key value pairs are commonly used in dictionaries, hash tables, and JSON objects.

• Keys are unique identifiers that are used to access the corresponding values.

• Examples include 'name: John', 'age: 30', 'city: New York'.
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The aptitude test was quite easy, you just have to be good in English and some logical questions.

Q1. First of all, He asked me my intro, then he asked what programming language I know, then he asked me basics of C language and Java. That's all.
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Q1. What is your family background?
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Q2. Where do you see yourself in 5 years?
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Q3. What are your strengths and weaknesses?
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Q4. Tell me about yourself.
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