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Beranda / Subjek Wawancara / Data Modeling
WithoutBook LIVE Mock Interviews Data Modeling Related interview subjects: 24

Interview Questions and Answers

Know the top Data Modeling interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Total 30 questions Interview Questions and Answers

The Best LIVE Mock Interview - You should go through before interview

Know the top Data Modeling interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Interview Questions and Answers

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Experienced / Expert level questions & answers

Ques 1

How do you optimize database performance in a data model?

Performance optimization involves proper indexing, query optimization, and denormalization when necessary. It also includes choosing appropriate data types, partitioning tables, and optimizing SQL queries.

Example:

Example: Indexing frequently queried columns in a 'User' table to speed up search operations.
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Ques 2

How do you handle concurrency issues in a database?

Concurrency control mechanisms, such as locking or optimistic concurrency control, are used to manage simultaneous access to data and prevent conflicts during transactions.

Example:

Example: Using row-level locking to ensure that two transactions don't modify the same row simultaneously.
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Ques 3

How do you handle historical data in a data warehouse?

Handling historical data involves using slowly changing dimensions (SCDs), where changes to data over time are tracked. SCD types include Type 1 (overwrite), Type 2 (add new row), and Type 3 (add columns).

Example:

Example: Using Type 2 SCD to add a new row for an employee when their department changes over time.
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