400+ MySQL Interview Questions Practice Test

1. The primary purpose of normalizing a database is to reduce data redundancy improve data integrity (A) because it involves organizing data in such a way that data is stored only once, thus minimizing the risk of inconsistencies and improving the efficiency of data storage and updates.

2. In MySQL, to remove duplicate rows from a result set, you would use the DISTINCT keyword (A). It eliminates all duplicate rows, ensuring that each row in the final result set is unique.

3. The ACID properties are crucial for managing database transactions effectively. They stand for Atomicity, Consistency, Isolation, and Durability (B), and they ensure that transactions are processed reliably, maintaining the integrity and consistency of data within the database system.

4. Indexes in MySQL are automatically created for primary key columns (B). They speed up data retrieval significantly but can slow down data insertion and updates because the index must be updated whenever the data it references changes. Full-text indexes (C) are used specifically for text-based searches across large bodies of text within a database. And no, they do consume additional storage space (D).

5. The main advantage of using stored procedures in MySQL is to offer better performance by reducing network traffic (B). Stored procedures allow you to execute multiple SQL operations as a single call and keep the processing on the server side, thereby reducing the amount of data transferred over the network. While they can also offer security benefits by encapsulating logic directly on the database server (A), and provide centralized logic for complex tasks, their primary advantage is performance enhancement through reduced network traffic.

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