Senior Software Engineer Mock Interview
Practice 47 Senior Software Engineer interview questions covering system design, architecture decisions, and technical leadership.
Question 13 of 47
What criteria do you use when deciding whether to use a SQL solution instead of NoSQL for your project?
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William Swansen has worked in the employment assistance realm since 2007. He is an author, job search strategist, and career advisor who helps individuals worldwide and in various professions to find their ideal careers.
While SQL and NoSQL database solutions are viable, each has a specific purpose and advantages when used properly. Knowing this and communicating it effectively is the key to responding to the interviewer's question. The use of SQL and NoSQL can be debated. Your ability to communicate the advantages of each one and the criteria you use to determine this is what the interviewer is interested in.
William Swansen has worked in the employment assistance realm since 2007. He is an author, job search strategist, and career advisor who helps individuals worldwide and in various professions to find their ideal careers.
"Both SQL and NoSQL database solutions are helpful if used properly. When NoSQL was introduced, the common process was to start with NoSQL for smaller database requirements and then evolve to a SQL solution as the database grew. Now, it is easier to project how big the database will be, and you can start with the appropriate solution. It is far easier to start with a SQL database and allow it to grow than to start with NoSQL and have to transition to SQL at some time in the future."
William Swansen has worked in the employment assistance realm since 2007. He is an author, job search strategist, and career advisor who helps individuals worldwide and in various professions to find their ideal careers.
Knowing the differences between SQL and NoSQL is critical for the role of a senior software engineer. Communicating your understanding of this topic effectively is the key to responding appropriately to the interviewer's question. Make sure to state your answer in simple, easy-to-understand language, and don't assume that the interviewer has a technical background.
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I would focus on the client's needs and determine if the client requires a scalable and highly available application and if their underlying data needs to be flexible. Since SQL databases typically do not scale horizontally, they instead scale vertically and make scalability a bigger concern. And since most SQL databases only have a single node (unless you are using something like Amazon RDS), this means that there is one point of failure and restoring services are dependent on bringing the single database node back online. Whereas with NoSQL, the underlying data structure is flexible and the NoSQL collections themselves can be sharded and the nodes can be scaled easily. If one node were to go down, the other node would resume the role as primary and allows you to find the root cause with minimal downtime on the application.
Amanda's Feedback
This is a solid response! Consider making it even more impactful by talking about a project you completed that used an SQL solution and why that was the right choice. Do the same for a NoSQL solution-oriented project. Make sure to end your response with the positive outcome of your choices.
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