32 MySQL interview questions you need to know to land your dream job 😎
MySQL involves operating system concepts such as data storage, locking, disk seeking, paging, etc., so interviewers often ask about them.
This article will share some of the high-frequency MySQL interview questions that I have summarized myself, hoping to help you.
Database Type and Comparison:
- Differences and advantages between relational and non-relational databases.
MySQL Transaction:
2. The four major characteristics of MySQL transactions.
Storage Engines:
3. Key differences between common MySQL storage engines.
4. Characteristics of MyISAM storage engine.
5. Characteristics of InnoDB storage engine.
6. A comparison between MyISAM and InnoDB storage engines.
MySQL Architecture:
7. Overview of MySQL’s core architecture, including components like the connector, query cache, parser, optimizer, and executor.
SQL Query Execution:
8. The sequence of execution for SQL queries, including joins, filtering, grouping, and ordering.
Temporary Tables:
9. What temporary tables are and when they are typically removed.
Indexing:
10. Common types of MySQL indexes.
11. The differences between varchar and char and their use cases.
Join Types:
12. Explanation of inner joins, outer joins, cross joins, and Cartesian products.
Index-Related Topics:
13. Classification of indexes.
14. Principles of index implementation.
15. Estimating the number of records a 3-level B+ tree can store.
16. Scenarios where indexes can become ineffective.
17. Understanding index lookups (covering indexes).
Locking:
18. Row locks, gap locks, and next-key locks.
Optimization Strategies:
19. Considerations when creating tables.
20. Common metrics in the EXPLAIN statement.
21. MySQL optimization approaches.
22. Common SQL optimization techniques.
23. Dealing with slow SQL queries.
24. Diagnosing and optimizing deadlock situations.
Architecture Topics:
25. Brief overview of MySQL’s architecture.
26. High availability solutions for MySQL.
27. Detailed discussion of database sharding and partitioning.
Transaction-Related:
28. Isolation levels in transactions.
29. Understanding scenarios leading to dirty reads and phantom reads.
30. The difference between read committed and repeatable read, and how repeatable read is implemented.
31. Distinctions between distributed and local transactions.
32. Understanding Spring’s transaction propagation mechanism.
I hope you enjoyed this article and learned something new about MySQL. If you have any questions, comments, or feedback, please feel free to share them in the comment section below.
Good luck with your interview!
