By default, mysqldump writes information as SQL statements to the standard output. You can save the output in a file:
mysqldump --all-databases > dump.sql
To dump only specific databases, name them on the command line and use the
mysqldump --databases db1 db2 db3 > dump.sql
option causes all names on the command line to be treated as database names. Without this option, mysqldump treats the first name as a database name and those
following as table names.
--databases, mysqldump writes
CREATE DATABASE and
USE statements prior to the dump output for each database. This ensures that when
the dump file is reloaded, it creates each database if it does not exist and makes it the default database so
database contents are loaded into the same database from which they came. If you want to cause the dump file to
force a drop of each database before recreating it, use the
--add-drop-database option as well. In this case, mysqldump writes a
DROP DATABASE statement preceding each
CREATE DATABASE statement.
To dump a single database, name it on the command line:
mysqldump --databases test > dump.sql
In the single-database case, it is permissible to omit the
mysqldump test > dump.sql
When you reload the dump file, you must specify a default database name so that the server knows which database to reload.
For reloading, you can specify a database name different from the original name, which enables you to reload the data into a different database.
If the database to be reloaded does not exist, you must create it first.
To dump only specific tables from a database, name them on the command line following the database name:
mysqldump test t1 t3 t7 > dump.sql