Data Modeling 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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