What is a database dump?

A database dump is a file containing the structure and/or data of a database. It is used for backup, restore, migration, or creating a copy of the database.

Main types of dumps:

• Schema dump: Contains only the definitions of tables, views, indexes, procedures, and other database objects.
• Data dump: Contains only the data stored in tables.
• Full dump: Contains both the structure and data of the database.

Dump formats may vary depending on the database management system (DBMS), but often it is a text file containing SQL commands (CREATE TABLE, INSERT, ALTER TABLE, etc.).

Example command to create a dump in PostgreSQL:

# Creates a full dump of the database "mydatabase" into the file "mydatabase_dump.sql"
pg_dump mydatabase > mydatabase_dump.sql

Example command to create a dump in MySQL:

# Creates a full dump of the database "mydatabase" using the mysqldump utility
mysqldump -u username -p mydatabase > mydatabase_dump.sql