How do you back up a database in SQL Server, PostgreSQL, or MySQL?

Short answer: SQL Server: To back up a database in SQL Server, you can use the BACKUP DATABASE command.

Explain a bit more

- Full Backup BACKUP DATABASE MyDatabase TO DISK = 'C:\Backups\MyDatabase.bak'; - Transaction Log Backup BACKUP LOG MyDatabase TO DISK = 'C:\Backups\MyDatabase_log.trn'; PostgreSQL: In PostgreSQL, you can use the pg_dump command for backing up the database. - Full Backup pg_dump mydatabase > /path/to/backup/mydatabase.sql For backing up with compression or other options: pg_dump -Fc mydatabase > /path/to/backup/mydatabase.dump For transactional backups, you can use WAL (Write-Ahead Logging) archiving, typically managed through archive_mode and archive_command settings in the postgresql.conf. MySQL: In MySQL, you can use the mysqldump command for backing up the database. - Full Backup mysqldump -u username -p mydatabase > /path/to/backup/mydatabase.sql For binary logging (transaction logs), MySQL uses binlog: - Enabling binary log [mysqld] log-bin=mysql-bin

Real-world example (ShopNest)

ShopNest’s SQL Server database stores customers, products, and orders. Good indexes and clear foreign keys keep checkout queries fast and safe.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.