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Export and Import all MySQL databases at one time

Export:

mysqldump -u root -p --all-databases > alldb.sql

Look up the documentation for mysqldump. You may want to use some of the options mentioned in comments:

mysqldump -u root -p --opt --all-databases > alldb.sql
mysqldump -u root -p --all-databases --skip-lock-tables > alldb.sql

Import:

mysql -u root -p < alldb.sql


Ref:
https://stackoverflow.com/questions/9497869/export-and-import-all-mysql-databases-at-one-time
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