How do you handle database connections in Node.js?
Use connection pooling (Mongoose handles this by default). Store the connection string in an environment variable. Handle connection errors gracefully. Use one connection for the whole app, not one per request, to reuse the pooled connection.
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More FAQs in Database Interview Questions for Node.js Developers
SQL is relational with tables, rows, fixed schema, ACID transactions, and complex joins. NoSQL is non-relational with flexible schemas, designed for horizontal scaling and document-like data. Choose based on data shape and query patterns.
Start with the queries you will run. For NoSQL, embed small coupled data, reference large or shared data, use Mongoose for schema management. For SQL, normalize and use migrations. Design for queries, not for storage elegance.
Embed stores nested data within a document for fast reads with duplication. Reference stores related data by id for consistency, requiring populate. Embed for always-read-together data; reference for shared or large data.
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