Technologies Coding Problems Bookmarks Learning Paths

Technologies Coding Problems Bookmarks Learning Paths

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What is a database? | Databases | mysql Interview Questions | NextRound.in

Questions

2 of 6

1How to copy a database in mysql?

2What is a database?

3How to list databases on our mysql instance?

4How to create a database in mysql and how to list existing databases?

5How to use a specific database on our mysql instance?

6How to delete a database?

mysql

Functions and Operators

02 / 06

What is a database?

Difficulty: 2/10

relational storage, SQL querying, ACID guarantees

In the context of RDBMS (Relational Database Management System), a database is a structured collection of interrelated data that is organised into tables (having relations) to allow efficient storage, retrieval, and manipulation of data.

Scenario Questions

0-2 years experience

1If you need to store user profiles for a small web app using MySQL, how would you decide what tables and columns to create?
2What happens if you try to insert a row that violates a NOT NULL constraint in a MySQL table?
3How would you write a MySQL query to retrieve all orders placed in the last 24 hours?

2-5 years experience

1We added a new column to a high‑traffic orders table and started seeing deadlocks. Walk me through how you would investigate and resolve the issue.
2Your feature requires paginating results from a MySQL table, but the page numbers are sometimes off. What could cause that and how would you fix it?
3Explain why a query that used to run in 200 ms now takes several seconds after the data volume grew, and what steps you’d take to improve it.

5-8 years experience

1Design a sharding strategy for a MySQL‑backed user‑account service that must scale to 100 M users while keeping strong consistency for login checks.
2How would you redesign a monolithic MySQL schema to support multi‑tenant SaaS isolation without sacrificing performance?
3We need to add read‑replicas for reporting while ensuring writes stay consistent. What trade‑offs and failure modes do you need to consider?

8+ years experience

1Our company is moving from an on‑prem MySQL cluster to a cloud‑native managed service. What architectural changes, data‑migration steps, and cross‑team coordination would you plan to minimize downtime and risk?
2When evaluating whether to keep a legacy MySQL database or replace it with a polyglot persistence layer, what criteria and long‑term maintenance factors would you bring to the decision?
3How would you set up organization‑wide guidelines for schema versioning, migration tooling, and observability to support dozens of teams using MySQL?

Follow-up Questions

Can you give an example of when you chose a specific MySQL storage engine and why?
What impact does MySQL's default isolation level have on concurrent writes?
How do you typically monitor the health and performance of a MySQL instance in production?

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