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

SQL Server:

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

• - 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