How do you understand that the problem is not in the code, but specifically in the database?
PHP
What types of user interface layouts have you implemented and used in your projects?
What is the minimum and maximum permissible interval for running automatic Cron scripts?
Have you been involved in improving the performance and efficiency of SQL queries?
Do you have practical experience using NoSQL databases in projects?
Can you name the main search engines that you know?
What is more important to you during code review: architecture, readability, performance, or testability?
Tell me about a complex interesting problem, preferably related to fault tolerance or relevant to this position.
Which PHP framework have you worked with the most and what are its pros and cons?
Are there any questions about the functionality, team, or working conditions?
Have you had experience with database replication and sharding?
How do you optimize SQL queries? What do you use for this?